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WO2019031671A1 - Procédé, station de base et équipement utilisateur permettant de transmettre et détecter une réponse d'accès aléatoire - Google Patents

Procédé, station de base et équipement utilisateur permettant de transmettre et détecter une réponse d'accès aléatoire Download PDF

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Publication number
WO2019031671A1
WO2019031671A1 PCT/KR2018/002262 KR2018002262W WO2019031671A1 WO 2019031671 A1 WO2019031671 A1 WO 2019031671A1 KR 2018002262 W KR2018002262 W KR 2018002262W WO 2019031671 A1 WO2019031671 A1 WO 2019031671A1
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Prior art keywords
random access
access response
detection window
preamble
type
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English (en)
Inventor
Chen QIAN
Qi XIONG
Bin Yu
Yingjie Zhang
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal

Definitions

  • the present disclosure relates to wireless communication technology, in particular to a method, a base station, and use equipment (UE) for transmitting and detecting a random access response.
  • UE use equipment
  • the 5G or pre-5G communication system is also called a 'beyond 4G network' or a 'post LTE system'.
  • the 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60GHz bands, so as to accomplish higher data rates.
  • mmWave e.g., 60GHz bands
  • MIMO massive multiple-inputmultiple-output
  • FD-MIMO fulldimensional MIMO
  • array antenna an analog beam forming, large scale antenna techniques are discussed in 5G communication systems.
  • RANs cloud radio access networks
  • D2D device-to-device
  • wireless backhaul moving network
  • CoMP coordinated multi-points
  • FQAM FSK and QAM modulation
  • SWSC sliding window superpositioncoding
  • ACM advanced coding modulation
  • FBMC filter bank multicarrier
  • NOMA non-orthogonal multipleaccess
  • SCMA sparse code multipleaccess
  • Random Access (RA) process is an important step for establishing a communication link between the user side and the network side in a wireless communication system.
  • RA is used to establish uplink synchronization between a UE and a base station, and is also used by the base station to assign an identification (ID) for the UE.
  • ID an identification
  • the performance of a random access directly affects the user's experience.
  • the random access procedure is applied to a plurality of scenes suchas establishing an initial link, a cell handover, re-establishing an uplink, re-establishing an RRC connection, and the like.
  • the random accesses are typified into Contention-based Random Access and Contention-free Random Access.
  • the Contention-based Random Access in the process of each user's attempting to establish the uplink, if a preamble is selected from the same preamble resources, there may be multipleusers selecting the same preamble to transmit to the base station, so the conflict resolution mechanism is an important research direction in random access. How to reduce the probability of conflict and how to quicklyresolve the conflicts occurred, are the key indicators to effect random access performance.
  • Contention-based random access process in LTE-A is divided into four steps, as shown in Figure 1.
  • a preamble is selected from the preamble resource pool by the user randomly and transmitted to a base station.
  • the base station performs the correlation detecting for the receiving signals to identify the preamble transmitted by the user.
  • the base station transmits a random access response (RAR) to the user, which contains a random access preamble identifier, a timing advance instruction determined according to the time delay between the user and the base station, Cell-Radio Network Temporary Identifier (C-RNTI), and the time-frequency resources assigned for the next uplink transmission of the user.
  • RAR random access response
  • C-RNTI Cell-Radio Network Temporary Identifier
  • a third message is transmitted by the user to the base station according to the information in the RAR.
  • Msg3 contains information suchas a user terminal identifier and a RRC link request, wherein, the user terminal identifier is unique to the user to resolve the conflict.
  • the base station transmits a collision resolution identifier to the user, which includes the user terminal identifier of the user who wins in the conflict.
  • the temporary C-RNTI is upgraded to a C-RNTI and an ACK signal is transmitted to the base station by the user to complete the random access procedure, and then the user waits for the scheduling of the base station. Otherwise, the user will start a new random access process after a delay.
  • a preamble may be assigned for the user because the base station has known the user identifier. So the user does not need to select the sequence randomly when transmitting the preamble, butuses the assigned preamble.
  • the base station After detecting the assigned preamble, the base station transmits a corresponding random access response, including timing advance and uplink resource assignment and so on. After receiving the random access response, the user considers that the uplink synchronization has been completed and waits for furtherscheduling of the base station.
  • the contention-free random access procedure consists of only two steps: the first step is to transmit a preamble; the second step is the transmission of the random access response.
  • the length of a detection window for detecting a random access response is configured by the high layer signaling, starting at the subframethat contains the end of a preamble transmission plus three subframes, the RA-RNTI corresponding to the time-frequency resources usedfor transmitting the preamble is used to monitor the physical downlink control channel in the random access response detection window configured by the high layer signaling.
  • Figure 2 shows the monitoring pattern of a random access response in LTE.
  • the physical downlink control channel is monitored in the random access response detection window configured by the high layer signaling, starting from the third subframe(202) after the subframe for completing the transmission of the preamble (201).
  • Figure 2 shows a case that the length of a random access response detection window (203) is configured as three subframes.
  • the detection mode of a random access response also is need to adjust according to the requirement to adapt the terminals with different abilities.
  • the purposeof the present disclosure is relates to overcome the defects of the prior art, and to provide a method for detecting and transmitting a random access response, in order to support the terminal with beam correspondence and the terminal without beam correspondence at the same time in the cell.
  • configuration information of a random access channel comprisesing configurationfirst information for configuringabout a random access response detection window for a first type of UE and configurationsecond information for configuringabout a random access response detection window for a second type of UE; wherein the first type of UE has beam correspondence, and the second type of UE does not have the beam correspondence;
  • the configuration information for configuringabout the random access response detection window for athe first type of UE with the beam correspondence comprises: at least one of information of thea length of the random access response detection window, and/or information of thea start position of the random access response detection window;
  • the configuration information for configuringabout the random access response detection window for athe second type of UE without the beam correspondence comprises: at least one of information of thea length of the random access response detection window, and/or information of thea start position of the random access response detection window.
  • the configuration information for configuringabout the random access response detection window for athe second type of UE comprises:
  • the information of the start position of the random access response detection window comprises: information of the start position of a random access response detection window corresponding to the first random access channel resource in the random access channel resource set and gap between two adjacent random access response detection windows.
  • detecting the random access response according to its beam correspondence and the configuration of the random access response detection window comprises:
  • the random access channel resource set comprises one or more random access channel resources.
  • the method for detecting the random access response comprises:
  • RA-RNTI random access response-radio network temporary identification
  • detecting and receiving the random access response according to the RA-RNTI corresponding to the one or more random access channel resources used for transmitting the preamble comprises:
  • the random access response is detected and received successfully when a downlink control channel is detected and decoded successfully according to the RA-RNTI, the downlink resource assignment indicated by the downlink control channel is decoded successfully, and a preamble identifier matched with the transmitted preamble is detected in the random access response carried in time-frequency resource indicated by the downlink resource assignment in the downlink control channel.
  • detecting and receiving the random access response according to the RA-RNTI corresponding to the one or more random access channel resources used for transmitting the preamble comprises:
  • the method for detecting the random access response by the second type of UE comprises:
  • the method for detecting the random access response by the second type of UE comprises:
  • the method for detecting the random access response by the second type of UE comprises:
  • the method for detecting the random access response by the second type of UE comprises:
  • determining the procedure of receiving the random access response fails, when no random access response is successfullyreceived in any random access response detection window corresponding to all the random access channels in the random access channel resource set used for transmitting the preamble according to the RA-RNTIs of the random access channels.
  • the method for detecting the random access response by the second type of UE comprises:
  • the method for detecting the random access response by the second type of UE comprises:
  • the present disclosure provides a method for transmitting a random access response, which includes the following steps:
  • configuration information of a random access channel comprises configuration information for configuring a random access response detection window for a first type of UE and configuration information for configuring a random access response detection window for a second type of UE; wherein the first type UE has beam correspondence, and the second type UE does not have the beam correspondence;
  • the configuration information for configuring the random access response detection window for the first type of UE comprises: information of the length of the random access response detection window, and/or information of the start position of the random access response detection window; and
  • the configuration information for configuring the random access response detection window for the second type of UE comprises: information of the length of the random access response detection window, and / or information of the start position of the random access response detection window.
  • the configuration information for configuring the random access response detection window for the second type of UE comprises:
  • the information of the start position of the random access response detection window comprises: information of the start position of a random access response detection window corresponding to the first random access channel resource in the random access channel resource set and gap between two adjacent random access response detection windows.
  • transmitting the random access response according to random access channel resources, the detected preamble and the configuration of the random access response detection window comprises:
  • transmitting the random access response comprises:
  • transmitting the random access response comprises:
  • transmitting the random access response comprises: selecting a random access channel resource with the strongest correlation detection and transmitting the random access response in a random access response detection window corresponding to the random access channel resource, if a preamble is detected on the second type of random access channel resources used for the second type of UE to transmit the preamble, or if the transmission of the preamble for the second type UE is detected, or if a same preamble is detected on a plurality of random access channel resources in the same random access channel resource set.
  • transmitting the random access response comprises: sorting and numberingthe random access channel resources in which same preambles are detected according to energies of correlation detection, and transmitting corresponding index information in the corresponding random access response, if a preamble is detected on the second type of random access channel resources used for the second type of UE to transmit the preamble, or if the transmission of the preamble for the second type UE is detected, or if a same preamble is detected on a plurality of random access channel resources in the same random access channel resource set.
  • transmitting the random access response comprises: selecting a random access channel resource with the strongest correlation detection and transmitting the random access response in a random access response detection window corresponding to the random access response if the transmission of the same preamble is detected in different directions of the receiving beam on a same random access channel resource. .
  • transmitting the random access response comprises: sorting and numberingthe random access channel resources in which same preambles are detected according to energies of correlation detection, and transmitting corresponding index information in the corresponding random access response if the transmission of the same preamble is detected in different directions of the receiving beam on a same random access channel resource.
  • the present disclosure provides a device for detecting random access response, which includes the following processing modules:
  • a random access channel configuration information acquisition module is to obtain configuration information of a random access channel; wherein, the configuration information of the random access channel comprises configuration information for configuring a random access response detection window for a first type of UE and configuration information for configuring a random access response detection window for a second type of UE; wherein, the first type of UE has beam correspondence, and the second type of UE does not have the beam correspondence;. and
  • a random access response detecting module is to detect a random access response according to its beam correspondence and configurationof the random access response detection window after transmitting a preamble.
  • the present disclosure provides a device for transmitting random access response, which includes the following processing modules:
  • a random access channel configuration information transmitting module is to transmit configuration information of a random access channel, wherein the configuration information of the random access channel comprises configuration information for configuring a random access response detection window for a first type of UE and configuration information for configuring a random access response detection window for a second type of UE;
  • a random access response transmitting module is to transmit a random access response according to the random access channel resources, a preamble detected and configuration of the random access response detection window, after detecting the transmission of the preamble.
  • the present disclosure has the technical effects including butnot limited to: supporting the terminal with the beam correspondence and the terminal without the beam correspondence to detect the random access response at the same time, the waste of resources caused by traditional way and mismatching of transmitting / detecting means is avoided, and the runningefficiency of the whole system is improved.
  • Figure 1 is a schematic diagram illustrating a flow of traditional contention-based random access
  • Figure 2 is a schematic diagram illustrating the monitoring way of a random access response in the LTE
  • Figure 3 is a flow chart of a method for detecting a random access response of the present disclosure
  • Figure 4 is a flow chart of a method for transmitting a random access response of the present disclosure
  • Figure 5 is the division way of random access channel resources according to embodiment one of the present disclosure.
  • Figure 6 is a schematic diagram illustrating transmitting of a random access response of the two configuration ways
  • Figure 7 is a diagram illustrating the way of transmitting multipleTAs in a single random access response detection window
  • Figure 8 is a diagram illustrating the assignment of the random access channel resources
  • Figure 9 is a schematic diagram illustrating the random access response detection window
  • Figure 10 is an example of the random access response
  • Figure 11 is a schematic diagram illustrating the structure of the random access response detection window according to the embodiment two of the present disclosure.
  • Figure 12A is a schematic diagram illustrating the structure of a device for detecting a random access response
  • Figure 12B is another schematic diagram illustrating the structure of a device for detecting a random access response
  • Figure 13A is a schematic diagram illustrating the structure of a device for transmitting a random access response.
  • Figure 13B is another schematic diagram illustrating the structure of a device for transmitting a random access response.
  • a method and user equipment of selecting a random access channel of the present detailed description can be applied to a random access procedure of the FDD mode or the TDD mode wireless communication system, comprising a contention-based random access procedure and a contention-free random access procedure. Meanwhile, the method and the user equipment of selecting a random access channel of the present detailed description are suitablefor an operation scene of high frequency band multi-beamin the 5G technology.
  • the method for detecting a random access response of the present detailed description comprises the following steps:
  • Step 1301 configuration information of a random access channel is obtained, wherein the configuration information includes configuration information for configuring a random access response detection window for a first type of UE with the beam correspondence and configuration information for configuring a random access response detection window for a second type of UE without the beam correspondence.
  • Step 1302 a random access response is detected according to its beam correspondence and configuration information for configuring the random access response detection window after transmitting a preamble.
  • the method for transmitting random access response of the present embodiment comprises the following steps:
  • Step 2401 configuration information of a random access channel is transmitted, wherein the configuration information comprises configuration information for configuring a random access response detection window for a first type of UE with the beam correspondence and configuration information for configuring a random access response detection window for a second type of UE without the beam correspondence.
  • Step 2402 a random access response is transmitted according to random access channel resources, a preamble detected and configuration of the random access response detection window, after detecting the transmission of the preamble.
  • a method for detecting a random access response will be described in connection with a specific system. It is assumed that a system simultaneously supportsa terminal with the beam correspondence and a terminal without the beam correspondence to perform a random access procedure. Specifically, the system divides available random access channel resources into a first type of random access channel resources and a second type of random access channel resources. The first type of random access channel resources are used for the terminal with the beam correspondence to perform the random access procedure, and the second type of random access channel resource is used for the terminal without the beam correspondence to perform the random access procedure.
  • the first type of random access channel resources and the second type of random access channel resources adopt different time-frequency resource positions
  • the base station may determine whether or not the terminal has the beam correspondence based on the random access resources, so the terminals with the beam correspondence and the terminals without the beam correspondence may usethe same or different preamble resource pools.
  • a terminal with the beam correspondence and a terminal without the beam correspondence uses two completely different (i.e., not overlapping) preamble resource pools, or uses two preamble resource pools which are not exactly the same (i.e., partial preambles are coincident), or uses the same two preamble resource pools.
  • Figure 5 shows a division way of the random access channel resources in the present embodiment.
  • configuration information of the random access resources includes resource configuration of the first type of random access random access channel resources, which includes time-frequency resource position of the random access channel resource used by the terminal with the beam correspondence, information of a preamble resource pool (range of a preamble index that can be used by the terminal with the beam correspondence) usedby the terminal with the beam correspondence, and information needed when the terminal with the beam correspondence detects a random access response, which includes length of a random access response detection window, and the sequence of detecting a random access response.
  • the configuration information of the random access resources also includes resource configuration of the second type of random access random access channel resources, which includes time-frequency resource position of the random access channel resource used by the terminal without the beam correspondence, information of a preamble resource pool used by the terminal without beam correspondence (range of a preamble index that can be used by the terminal without the beam correspondence), and information needed when the terminal without the beam correspondence detects a random access response, which includes length of a random access response detection window, and the sequence of detecting a random access response.
  • the base station detects a preamble on an assigned random access channel. If transmission of the preamble is detected, the random access response is transmitted according to the following sequence:
  • the random access response is transmitted at the last subframeassigned to the first type of random access channel subframe plus k 1 subframes and the corresponding control channel is scrambled with RA-RNTI.
  • the base station assigns multiple random access channels (for a terminal without the beam correspondence attempting to use transmitting beams of multipledirections to try transmission of the preamble)
  • the random access response is transmitted at the last subframeassigned to the last random access channel plus k 2 + i subframes , and the random access response is scrambled with RA-RNTI in the corresponding downlink control channel.
  • the parameters k 1 and k 2 being the same or different are informed to the terminal by configuration information of the random access channel.
  • the parameter i is an optional parameter, if the parameter i is set to be 0, random access responses of all random access channels are transmitted on the same subframe;in another configuration mode, the parameter i may be related to the index of the random access channel, that is different random access channels correspond to different random access response detection windows.
  • the two transmission modes of the random access response for the terminal without the beam correspondence can be described by Figure 6.
  • Figure 6 is for a case that a terminal without the beam correspondence may be configured with multiple random access channels by the base station, on which the terminal transmits a preamble by the way of transmitting beam handover.
  • the base station may detect the same preamble on multiplerandom access channels.
  • the resources of the random access response can be configured in two modes as shown in Figure 6:
  • i is set to be 0.
  • the RA-RNTI corresponding to the multiplerandom access channels instructs different downlink shared channels to transmit different random access responses on the same downlink control channel.
  • the base station may select a random access channel with the strongest receiving energy from the random access channels detecting the same preamble, calculate the corresponding timing advance, and use the RA-RNTI corresponding to the random access channel to instruct the downlink share channel to transmit a random access response; or the base station may calculate all the random access channels detecting the preamble, calculate the corresponding timing advance, and use the RA-RNTI corresponding the random access channel to instruct different downlink share channels to transmit a random access response on the same downlink control channel.
  • i is not set to be 0.
  • the RA-RNTI corresponding to the multiplerandom access channels instructs different downlink shared channels to transmit different random access responses on different downlink control channels.
  • the base station If the base station detects that multiplerandom access channels transmit the same preamble, the base station selects a random access channel with the strongest receiving energy, transmits a random access response in the random access response transmitting time corresponding to the random access channel; or the base station transmits the corresponding random access response on the random access response transmitting time corresponding to all the detected random access channels.
  • detecting a preamble described above is to be understood that the correlation detecting result of the preamble is greater than a predetermined threshold. And the information suchas timing advance may be calculated by the correlation detecting result.
  • the base station needs to be configured the same preamble to perform repeated transmissions in order to detect the preambles by the way of receiving beam scan in the base station.
  • the base station may detect the same preamble on multiplereceiving beams on the same random access channel.
  • the base station may process the random access response as follows:
  • the base station selects the receiving beam direction with the strongest receiving energy, calculates the corresponding timing advance, generates a random access response, and uses the RA-RNTI generated by the time-frequency resource corresponding to the random access channel to instruct the corresponding physical downlink shared channel to transmit the random access response;
  • the base station calculates the timing advance required to receive the beam direction of the preamble, uses the RA-RNTI generated by the time-frequency resource corresponding to the random access channel to instruct the corresponding physical downlink shared channel to transmit the random access response, wherein, the random access response contains multipletiming advances.
  • each dashed frame corresponds to a receiving beam direction of the base station, and the base station receives the same preamble in multiplereceiving beam directions, and the base station uses the RA-RNTI generated by the random access channel resource in the detection window corresponding to the random access channel resource to scramble a control channel, and transmits the random access response in the downlink share channel instructed by the control channel.
  • the random access response carries multipledetected timing advances, and the resource assignment information transmitted by the corresponding message 3.
  • the operation on the base station side may affect the detection of a random access response on the terminal side.
  • the terminal Before attempting a process of random access, the terminal reads configuration information of the random access channel from the broadcast channel in the sync signal block, and acquires the random access channel resources assigned to the terminal with beam correspondence and the terminal without beam correspondence, and the corresponding configuration information for configuring a random access response detection window.
  • the configuration information includes information suchas the start position indication k 1 and k 2 of the random access response detection window, length of the random access response detection window, and the like.
  • the terminal may uses the RA-RNTI corresponding to time-frequency resources of the random access channel used for transmitting the preamble to monitor the downlink control channel in a random access response detection window.
  • the start position of the random access response detection window is the subframe (time slot) that contains the end of the preamble transmission plus k 1 subframes (time slots) , the length of window is N 1 subframes (time slots), and the base station configures and informs the terminal by configuration information of the random access channel.
  • the downlink control channel is monitored only by one RA-RNTI (determined by the random access channel time-frequency resource transmitting the preamble). If the control information scrambled by the corresponding RA-RNTI is detected in the downlink control channel, the random access response is read on the downlink shared channel indicated by the control channel.
  • the base station configures a plurality of random access channels so that the terminal without the beam correspondence transmits the same or different preambles by the way of beam handover/scan.
  • the terminal may uses multiple RA-RNTIs to monitor the downlink control channel in a random access response detection window.
  • the start position of the random access response detection window is the last subframe(time slot) of the last random access channel plus k 2 subframes (time slots), length of the window is N 2 subframes (time slots), which is configured and informed to the terminal through configuration information of the random access channel by the base station.
  • the terminal needs to use multipleRA-RNTIs simultaneously to monitor the downlink control channel, the multipleRA-RNTIs are determined by the random access channel for transmitting the preamble. If the terminal successfullydecodes in the random access response detection window by one or more RA-RNTIs, the downlink resource assignment assigned by the corresponding control channel is continued. If a preamble identifier used for transmission is detected on the downlink resource assignment corresponding to the one or more RA-RNTIs, detecting of the random access response is successful.
  • the random access response detection windows corresponding to the respective random access channel do not overlap each other.
  • the terminal uses the corresponding RA-RNTI within the random access response detection window corresponding to each random access channel to monitor the downlink control channel.
  • the decoding is successful, the corresponding downlink resource assignment information is read and the preamble identifier contained therein is detected. If it is detected that one or more preamble identifiers match with the transmitted preamble, then detecting of the random access response is successful.
  • the method provided in the present embodiment is also applicable to the case that only one type of terminals exists in the system or the base station is configured with the random access channel resources suitablefor one type of terminals only. For example, if the system only supportsa terminal without the beam correspondence, the base station only assigns and informs the random access channel resources and configuration information of the corresponding random access response detection for the terminal without the beam correspondence. Terminals in the cell are processed according to the mode of the random access preamble transmission and the random access response detecting of the terminal without the beam correspondence.
  • the way provided by the present embodiment is applicable to a Contention-based or Contention-free random access procedure.
  • the base station may configure a plurality of random access channel resources referring to the processing way for the terminal without the beam correspondence, and the terminal may select random access channel resources, of which the numberis not larger than numberof the configured random access channel resources, to transmit the preamble according to its own requirements (e.g., the numberof coverage or transmission beams), and detect the random access response according to the corresponding detecting method of the random access response.
  • the base station may configure a plurality of random access channel resources referring to the processing way for the terminal without the beam correspondence, and the terminal may select random access channel resources, of which the numberis not larger than numberof the configured random access channel resources, to transmit the preamble according to its own requirements (e.g., the numberof coverage or transmission beams), and detect the random access response according to the corresponding detecting method of the random access response.
  • the mode provided by the present embodiment is also applicable to a case that only a terminal with the beam correspondence is present in the system or a base station is configured with random access channel resources only suitable for the terminal with the beam correspondence.
  • time-frequency resources of the random access channel for a terminal with the beam correspondence and a terminal without the beam correspondence are shared, butusing random access preamble groups which do not overlap each other. That is all the available preambles are divided into a first group of preambles and a second group of preambles. The two groups of preambles do not overlap each other, the first group of preambles are used for terminals with the beam correspondence, and the second group of preambles are used for terminals without the beam correspondence.
  • the base station assigns a plurality of random access channel resource sets, each of which is composed of a plurality of random access channels.
  • the division of the random access channel resource set and the time-frequency position of the random access channels constituting the random access channel resource set are informed to the terminal by the base station through the main information block in the broadcast channel in the synchronization signal block or the random access configuration carried in the system information carried by the system information block indicated by the main information block.
  • the random access channel resource set designated by the random access configuration information carried by the broadcast channel in different synchronization signal blocks is different, which is used to distinguish the different transmitting beam directions on the base station side.
  • the base station enables the random access channel in the random access channel resource set to transmit a single or repeated or a plurality of preambles according to whether or not the terminal has the beam correspondence, and informs the terminal by the information suchas the preamble format.
  • a random access channel in the random access channel resource set is selected according to the configuration information of the base station or a random access channel used for transmitting a preamble is selected randomly in equal probability from all of the available random access channels.
  • the base station may also configure the terminal to transmit by the same beam in a plurality of random access channels of the same random access channel resource set.
  • the terminal transmits a preamble by different beam directions on different random access channels according to the numberof transmitting beam directions supported by it.
  • a random access channel resource set is composed of M random access channel resources, wherein, the parameter M is a positive integer.
  • a random access channel resource is selected for transmitting of a preamble (a plurality of random access channels may be selected to transmit except for the example shown in the figure); for a terminal without the beam correspondence, multipleeven all the random access channel resources are selected for transmitting the preamble.
  • each random access channel in the random access channel resource set is discrete in time, and the other possibility is each random access channel in the random access channel resource set is continuous in time.
  • the random access resource set corresponding to different broadcast channel resources is divided by time or by frequency in order to correspond to different transmitting beam directions on the base station side.
  • the mode and flow of detecting a random access response of a terminal with the beam correspondence is inconsistent with that of a terminal without the beam correspondence.
  • the base station configures the random access channel resources, the base station simultaneously configures the two types of the start position of terminal and the length of the random access response detection windows for the two types of terminals.
  • the terminal After completing the transmission of a preamble, the terminal detects the random access response on the last subframe(or slot) of the assigned random access channel resource plus k 1 subframes (or slots); for the terminal without the beam correspondence, the terminal detects the random access response on the last subframe(or slot) of the assigned random access channel resource set used for transmitting the preamble plus k 2 subframes (or slots) .
  • the parameters k 1 and k 2 are configured by the base station. If k 1 is equal to k 2 , only one parameter is required to be configured or be pre-set. The mode described above can be described by Figure 9.
  • the base station calculates a RA-RNTI according to the time-frequency resource of the random access channel of the detected preamble, and uses the RA-RNTI to scramble in the downlink control channel in the corresponding random access response detection window, transmits a random access response in the downlink time-frequency resource assigned by the control channel.
  • the processing mode may be as follows:
  • a random access channel with the strongest correlation detection is selected, a corresponding RA-RNTI is calculated based on the time-frequency resources of the random access channel, and the RA-RNTI is used to scramble in the random access response detection window, a random access response is transmitted in the downlink time-frequency resource assigned by the corresponding control channel.
  • multiple corresponding RA-RNTIs are calculated based on the time-frequency resources of the random access channels, and multiple corresponding random access responses are generated.
  • the following modes may be used to transmit the multiplerandom access responses:
  • the multiple random access responses are indicated by the same control channel within the random access response detection window. That is, a plurality of control information scrambled by different RA-RNTIs is transmitted in the same control channel simultaneously, which indicates different downlink resources, and a corresponding random access response is transmitted.
  • a corresponding RA-RNTI is calculated and the RA-RNTI is used to scramble the control information in the downlink control channel in the corresponding random access response detection window, a corresponding random access response is transmitted on the downlink time-frequency resource indicated by the control information. It should be noted that, in this way, the random access response detection windows corresponding to the different random access channels should not overlap.
  • the terminal reads configuration information of the random access response in the main information block or the system information block carried in the broadcast channel in the corresponding synchronization signal block to determine assignment of the random access channel time-frequency resource and information (I.e., a index range of the first group of preambles and a index range of the second group of preambles) of a preamble resource pool used by the terminal with the beam correspondence and the terminal without the beam correspondence.
  • configuration information of the random access response in the main information block or the system information block carried in the broadcast channel in the corresponding synchronization signal block to determine assignment of the random access channel time-frequency resource and information (I.e., a index range of the first group of preambles and a index range of the second group of preambles) of a preamble resource pool used by the terminal with the beam correspondence and the terminal without the beam correspondence.
  • the terminal selects a preamble based on the capability of the beam correspondence (i.e., whether or not having the beam correspondence). If having beam correspondence, the first group of preambles are selected; if not having beam correspondence, the second group of preambles are selected. The terminal randomly selects a preamble in the selected preamble group with equal probability.
  • the terminal selects the random access channel resources according to the capability of beam correspondence (i.e., whether or not having the beam correspondence). If having beam correspondence, a random access channel assigned by the base station or a random access channel resource selected randomly with equal probability from the random access channel resources in the random access channel resource set assigned by the base station is used to transmit a preamble. If not having beam correspondence, all or part of the random access channel resources in the random access channel resource set assigned by the base station are used to transmit a preamble.
  • the terminal detects a random access response in a random access response detection window after completing the transmission of a preamble.
  • the starting position of the random access response detection window is the subframe(or slot) that contains the end of the preamble transmission plus k 1 subframes (or timeslots) , length of the window is configured by the base station;
  • behaviour of the terminal is one of the following:
  • the terminal detects a random access response within a random access response detection window, the start position of the random access response detection window is at the last subframe(or slot) of the last random access channel of the random access channel resource set plus k 2 subframes (or timeslots) , length of the window is configured by the base station; the terminal calculates a RA-RNTI corresponding to each random access channel resource for transmitting the preamble, and uses the calculated RA-RNTI to monitor the downlink control channel in the random access detection window.
  • the terminal detects random access responses within a plurality of random access response detection windows.
  • the start position of a random access response detection window corresponding to the i th random access channel resource in the random access channel resource set is last subframe(or slot) of the last random access channel of the random access channel resource set plus k 2 +n(i)subframes (or slots) , length of the window is configured by the base station.
  • n(i) is a functionrelated to index i
  • the terminal uses the corresponding RA-RNTI to detect the downlink control channel in the random access detection window within the random access response detection window corresponding to the used random access channel resource.
  • the conditions of the terminal terminating to monitor a random access response are as follows:
  • monitoring the random access response is terminated after the random access response containing a random access preamble identifier matching the transmitted preamble is successfullyreceived. That is, if the downlink resource assignment indicated in the PDCCH scrambled by the RA-RNTI is successfullyreceived and the random access response therein contains the random access response preamble identifier corresponding to the transmitted random access response preamble, the random access response is received successfully;
  • the possible behaviour of the terminal is one of the following possibilities:
  • the terminal usesthe RA-RNTI corresponding to the random access resource used for transmitting the preamble to detect the downlink control channel in the random access response detection window individually, if the downlink resource assignment indicated in the PDCCH scrambled by a RA-RNTI is successfullyreceived and the random access response therein contains a random access response preamble identifier corresponding to the transmitted random access response preamble, the random access response is received successfully and the monitoring in the random access response detection window is terminated;
  • the terminal uses RA-RNTIs corresponding to all the random access resources usedfor transmitting the preamble to detect the downlink control channel in the random access response detection window.
  • a random access channel if the downlink resource assignment indicated in the PDCCH scrambled by a RA-RNTI corresponding to the random access channel resource is successfully received and the random access response therein contains a random access response preamble identifier corresponding to the transmitted random access response preamble, the random access response corresponding to the random access channel is received successfully, detecting the random access response detection window by the RA-RNTI corresponding to the random access channel resource is terminated, the RA-RNTIs corresponding to the other undetected random access channel resources are used to detect the random access response detection window untilthe RA-RNTIs corresponding to all the random access channel resources used for transmitting the preamble completes the monitoring of the random access response detection window.
  • the possible behaviour of the terminal is one of the following possibilities:
  • the terminal uses a RA-RNTI corresponding to the random access resource used for transmitting the preamble to detect the downlink control channel in the corresponding random access response detection window individually, if the downlink resource assignment indicated in the PDCCH scrambled by a RA-RNTI is received successfullyand the random access response therein contains a random access response preamble identifier corresponding to the transmitted random access response preamble, the random access response is received successfully and the monitoring in the subsequent random access response detection windows is terminated;
  • the terminal uses RA-RNTIs corresponding to all the random access resources used for transmitting the preamble to detect the downlink control channel in the corresponding random access response detection window.
  • a random access channel if the downlink resource assignment indicated in the PDCCH scrambled by a RA-RNTI corresponding to the random access channel resource is successfullyreceived and the random access response therein contains a random access response preamble identifier corresponding to the transmitted random access response preamble, the random access response corresponding to the random access channel is received successfully,detecting the random access response detection window by the RA-RNTI corresponding to the random access channel resource is terminated, the RA-RNTIs corresponding to the other undetected random access channel resources are used to detect the random access response detection window until the RA-RNTIs corresponding to all the random access channel resources used for transmitting the preamble completes the monitoring of the corresponding random access response detection window.
  • the method provided in the present embodiment is also applicable to the case that only one type of terminals exists in the system or the base station is configured with the random access channel resources suitablefor one type of terminals only. For example, if the system only supportsa terminal without the beam correspondence, the base station only assigns and informs the random access channel resources and configuration information of the corresponding random access response detection for the terminal without the beam correspondence. Terminals in the cell are processed according to the mode of the random access preamble transmission and the random access response detecting of the terminal without the beam correspondence.
  • the way provided by the present embodiment is applicable to a Contention-based or Contention-free random access procedure.
  • the base station may configure a plurality of random access channel resources referring to the processing way for the terminal without the beam correspondence, and the terminal may select random access channel resources, of which the numberis not larger than numberof the configured random access channel resources, to transmit the preamble according to its own requirements (e.g., the numberof coverage or transmission beams), and detect the random access response according to the corresponding detecting method of the random access response.
  • the base station may configure a plurality of random access channel resources referring to the processing way for the terminal without the beam correspondence, and the terminal may select random access channel resources, of which the numberis not larger than numberof the configured random access channel resources, to transmit the preamble according to its own requirements (e.g., the numberof coverage or transmission beams), and detect the random access response according to the corresponding detecting method of the random access response.
  • the mode provided by the present embodiment is also applicable to a case that only a terminal with the beam correspondence is present in the system or a base station is configured with random access channel resources only suitable for the terminal with the beam correspondence.
  • a method for detecting and transmitting a random access response will be described in connection with a specific system.
  • the focus of this embodiment is the mode of the base station transmitting a random access response and the mode of the terminal detecting the random access response after a terminal without the beam correspondence transmitting a preamble.
  • the scheme according to the present embodiment is applicable to the resource assignment mode of the embodiment 1 and the embodiment 2, without affecting the terminal without the beam correspondence and the base station's modes of detecting and transmitting the random access response.
  • the base station assigns a plurality of random access channel resources in the random access channel resource set for the sake of transmitting the preamble conveniently by the terminal without the beam correspondence.
  • the terminal transmits the preamble on multipleor all the random access channel resources, to determine the optimal beam direction from a plurality of transmit beam directions.
  • the base station may detect the same preamble on a plurality of random access channel resources and feedback the corresponding plurality of random access responses.
  • the base station detects the same preamble on a plurality of random access channel resources, the plurality of random access channel resources are sorted.
  • the criteria for sorting is according to size of the outputvalues of the correlation detection of the preambles, from big to small and the multiplerandom access channel resources are assigned indexes in turn.
  • the base station informs the terminal the priority indexes representing the corresponding priority in the way of explicit or implicit indication in the corresponding random access response.
  • the mode of explicit indication includes informing the corresponding index directly in the random access response, that is transmitting the bits for characterizing the corresponding receiving index of the random access channel in the random access response.
  • the base station needs to configure the terminal to transmit a duplicatepreamble so that the base station may receive the preamble in a way of receiving a beam scan.
  • the base station may detect the same preamble in multiple receiving beam directions on the same random access channel resources and determine multipletiming advances. This multipletiming advances correspond to the same random access channel and the same preamble, so they are transmitted in the same random access response.
  • the base station detects the same preamble in a plurality of receiving beam directions on the same random access channel resource, the plurality of receiving beam directions are sorted.
  • the sorting criterion is according to size of the outputvalues of the preambles correlation, from big to small and the base station sequentially assigns the priority indexes representing the priorities to the timing advances and the resource assignment indications of message 3 detected on the corresponding receiving beam directions.
  • the base station informs the respective receiving beam directions the determined timing advances, corresponding resource assignment information of the message 3, the temporary cell radio network temporary identifier (TC-RNTI) assigned to the preamble detected on the receiving beam direction in the corresponding random access response, and informs the corresponding indexes in an explicit or implicit way.
  • the explicit way is informing the corresponding indexes directly; the implicit way is to sort the timing advances and resource assignments of message 3 in the order of the indexes.
  • Figure 10 shows an example of an explicit and implicit indication in a random access response.
  • the aforementioned transmission description affects the behaviour of a terminal. Specifically, if the random access responses corresponding to a plurality of random access channel resources are detected successfully when detecting the random access responses, the possible behaviour of the terminal includes:
  • the terminal selects a random access response with the highest priority characterized by the priority index information, transmits the message 3 according to the content of the random access response;
  • the terminal selects a access response with the highest priority random characterized by multiple priority index information, transmits the message 3 according to the content of the random access response;
  • the terminal transmits the message 3 respectively according to the contents of each random access response.
  • the behaviour of the terminal may comprise:
  • the terminal selects a random access response with the highest priority characterized by the priority index information, transmits the message 3 according to the content of the random access response;
  • the terminal selects a access response with the highest priority random characterized by multiple priority index information, transmits the message 3 according to the content of the random access response;
  • the terminal transmits the message 3 respectively according to the contents of each random access response.
  • the method provided in the present embodiment is also applicable to the case that only one type of terminals exists in the system or the base station is configured with the random access channel resources suitable for one type of terminals only. For example, if the system only supportsa terminal without the beam correspondence, the base station only assigns and informs the random access channel resources and configuration information of the corresponding random access response detection for the terminal without the beam correspondence. Terminals in the cell are processed according to the mode of the random access preamble transmission and the random access response detecting of the terminal without the beam correspondence.
  • the way provided by the present embodiment is applicable to a Contention-based or Contention-free random access procedure.
  • the base station may configure a plurality of random access channel resources referring to the processing way for the terminal without the beam correspondence, and the terminal may select random access channel resources, of which the numberis not larger than numberof the configured random access channel resources, to transmit the preamble according to its own requirements (e.g., the numberof coverage or transmission beams), and detect the random access response according to the corresponding detecting method of the random access response.
  • the base station may configure a plurality of random access channel resources referring to the processing way for the terminal without the beam correspondence, and the terminal may select random access channel resources, of which the numberis not larger than numberof the configured random access channel resources, to transmit the preamble according to its own requirements (e.g., the numberof coverage or transmission beams), and detect the random access response according to the corresponding detecting method of the random access response.
  • the mode provided by the present embodiment is also applicable to a case that only a terminal with the beam correspondence is present in the system or a base station is configured with random access channel resources only suitable for the terminal with the beam correspondence.
  • the random access response is detected by using a way of a plurality of sub-randomaccess windows in a random access detection window.
  • the way described in the present embodiment is applicable to a terminal for transmitting a preamble on one or more random access timings when transmitting the preamble.
  • the transmission of the preamble on the multiple random access timings may adopt the same or different uplink transmitting beams.
  • the random access timing is to be understood as a random access channel resource in the foregoing embodiments for transmitting a complete preamble meeting the preamble format.
  • the base station configures one or more random access timings used for transmitting the preamble for the terminal needed to transmit the preamble. If the base station configures a pluralityof random access timings, the terminal may transmit the preamble by the same or different uplink transmitting beams on the multiple random access timings. The numberof random access timings used by the terminal is determined by the numberof uplink transmitting beams of the terminal, butnot greater than a maximum of numberof the random access timings configured by the base station.
  • the terminal After transmitting the preamble on a first random access timing, the terminal begins to detect the random access response in the random access response window starting at the k th subframe. The terminal detects a downlink control channel based on a RA-RNTI calculated by time-frequency resource of the first random access timing.
  • the parameter k is determined by preconditioning or configuration of the base station. If the configuration of the base station is adopted, the relevant parameter k is transmitted in configuration information of the random access.
  • Length of the random access response detection window is configured by the base station and needed to cover all the random access timings configured by the base station.
  • the detecting of the random access response is suspended,and the preamble of the random access response is transmitted on the time-frequency resource of the random access timing.
  • the terminal needs to use a RA-RNTI calculated by the time-frequency resources of all the random access timings that have been used for the preamble to detect within the random access response detection window.
  • One possible simplification scheme is to configure k1for the effective length of each RA-RNTI except the length of the random access response detection window. That is, the effective length of each RA-RNTI starts from the k' th subframeafter the end of the random access timing, and ends at the (k '+ k1) th subframe, all the RA-RNTIs calculated by the time-frequency resources of the random access timings in the k1 subframescan be used to detect the random access response.
  • the effective length of the RA-RNTI corresponding to the different random access timings may overlap, that is, the terminal may use multipleRA-RNTIs still to detect the random access response within the random access response detection window, butthe number of RA-RNTIs used simultaneously will be reduced.
  • the parameter k' is configured by the base station or is pre-set.
  • the effective length of the RA-RNTI corresponding to the first random access timing is calculated from the start time of the random access response detection window. The process above is shown in Figure 11.
  • the terminal If the terminal successfullydetects a random access response within the effective length of a RA-RNTI, a possible way is to transmit the preamble on the random access timing configured for the terminal, and the random access response is detected in the random access response detection window continuously. In this case, it is necessary to carry a measuring result or the sorting result of the measuring result of the corresponding preamble in the random access response so that the terminal selects the optimal transmitting beam.
  • the base station configures eight random access timings that can be used to transmit the preamble, and the terminal transmits the preamble on the eight random access timings and detects the random access response in the way described in the present embodiment.
  • the terminal successfullydetects the random access response within the effective length of the RA-RNTI calculated by the time-frequency resources of the second, fourth, and fifth random access timings, and the sorting result of the measuring result of the preamble carried in the random access response is 4, 2, 5.
  • the terminal determines the appropriate uplink transmitting beam according to the preset criteria.
  • the preset criterion is to select an uplink transmitting beam adopted by the random access timing corresponding to the random access response carrying with the best measuring result or optimal sorting result of the measuring results.
  • Another possible preset criterion is to select a random access response with equal probability in the detected random access responses randomly, and to determine the uplink transmitting beam according to its corresponding random access timing.
  • the terminal detects a random access response within the effective length of a RA-RNTI successfully, the random access response is detected successfully,the detection of the random access response can be terminated and the subsequentaccess or data transmission step is continued. In this way, it is not necessary to carry the measuring result information within the random access response.
  • the detection of the random access response may be terminated. If the random access response is not detected still at this time, the random access procedure is considered to fail.
  • the present disclosure also provides a device for detecting a random access response which may be on the terminal side, in accordance with the method for detecting a random access response on the terminal side.
  • Figure 12A is a structure schematic of the corresponding device and Figure 12B is another structure schematic of the corresponding device.
  • thea device (1210) includes a random access channel configuration information acquisition module (1220) and a random access response detecting module (1230).
  • the random access channel configuration information acquisition module is used to obtain configuration information of a random access channel.
  • the random access response detecting module is used to detect a random access response according to its beam correspondence and configuration of the random access response detection window after transmitting a preamble.
  • a device (1240) includes a transceiver and a processor.
  • the transceiver (1250) is capable of transmitting the preamble.
  • the processor (1260) obtains the configuration information of a random access channel.
  • the processor (1260) detects the random access response according to its beam correspondence and configuration of the random access response detection window.
  • the present disclosure also provides a device for transmitting a random access response which may be on the base station side, in accordance with the method for transmitting a random access response on the base station side.
  • Figure 13A is a structure schematic of the corresponding device and Figure 13B is another structure schematic of the corresponding device.
  • thea device (1310) includes a random access channel configuration information transmitting module (1320) and a random access response transmitting module (1330).
  • a random access channel configuration information transmitting module is used to transmit configuration information of a random access channel.
  • the random access response transmitting module is used to transmit a random access response according to the random access channel resources, a preamble detected and configuration of the random access response detection window, after detecting the transmission of the preamble.
  • a device (1340) includes a transceiver and a processor.
  • the transceiver (1350) transmits the configuration information of a random access channel.
  • the transceiver is capable of the random access response according to the random access channel resources, a preamble detected and configuration of the random access response detection window.
  • the processor (1360) detects the transmission of the preamble.
  • the processor (1360) transmits a random access response according to the random access channel resources, the preamble detected and configuration of the random access response detection window.
  • the disclosed systems, device and method may be implemented in other ways.
  • the embodiment of the device described above is merely schematic, for example, the dividing of the modules is only a kind of logical functiondividing, and there may be additional dividing ways in the process of actually implementation, for example, multiplemodules or components may be combined or integrated into another system, or some features may be ignored, or not executed.
  • the coupling, direct coupling or communication connection shown or discussed may be through some interfaces, and the coupling or communication connection of devices or modules may be electrical, mechanical, or other forms.
  • the modules considered as the separate component description may be or may not be physically separate, and the components shown as modules may be or may not be physical modules, i.e., being located in one place or being distributed over a plurality of network modules.
  • the part or all of the modules may be selected according to the actual needs to achieve object of the scheme of the present embodiment.
  • the functionalmodules in the various embodiments of the present application may be integrated in a processing module, or each module may be physically present individually, or two or more modules may be integrated in one module.
  • the integrated module may be implemented in the form of hardware, and may also be achieved in the form of software functionmodules.
  • ROM read only memory
  • RAM random access memory
  • magnetic disk a magnetic disk
  • optical disk a computer readable storage medium

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Abstract

La présente invention se rapporte à un système de communication de pré-5e génération (5G) ou 5G, apte à prendre en charge des débits de données supérieurs à ceux d'un système de communication de 4e génération (4G), tel qu'un système d'évolution à long terme (LTE). La présente invention concerne un procédé de transmission et de détection d'une réponse d'accès aléatoire, qui comprend le processus suivant. Un UE obtient des informations de configuration d'un canal d'accès aléatoire, qui comprend des informations de configuration d'une fenêtre de détection de réponse d'accès aléatoire pour un premier type d'UE et des informations de configuration d'une fenêtre de détection de réponse d'accès aléatoire pour un second type d'UE. Lorsque le premier type d'UE a une correspondance de faisceau, le second type d'UE n'a pas la correspondance de faisceau. Suite à la transmission d'un préambule, l'UE détecte une réponse d'accès aléatoire en fonction de sa correspondance de faisceau et de la configuration de la fenêtre de détection de réponse d'accès aléatoire. Par comparaison avec l'état de la technique, dans la présente invention, selon différentes capacités de la correspondance de faisceau de l'UE, l'UE adopte différentes configurations de détection de réponse d'accès aléatoire et utilise différents procédés pour détecter la réponse d'accès aléatoire, afin d'éviter la diminution de la performance d'accès aléatoire provoquée par des attributions de ressources incorrectes et des configurations de mode de détection incorrecte, et d'améliorer les performances d'accès globales du système de communication.
PCT/KR2018/002262 2017-01-09 2018-02-23 Procédé, station de base et équipement utilisateur permettant de transmettre et détecter une réponse d'accès aléatoire Ceased WO2019031671A1 (fr)

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