WO2017113132A1 - Random access method and base station - Google Patents

Abstract

Disclosed are a random access method and a base station. The method comprises: a base station receives, by means of an intelligent antenna, from N different directions, identical preambles sent by at least two terminals on identical time-frequency resources, wherein N is greater than or equal to 2; the base station sends random access responses to the N different directions by means of the intelligent antenna, wherein temporary cell radio network temporary identifiers (TC-RNTIs) for scrambling carried in the random access responses are different; the base station receives, by means of the intelligent antenna, from M different directions, feedback messages sent by the terminals after receiving the random access responses; the base station sends access messages comprising terminal identifiers to the M different directions by means of the intelligent antenna, wherein the terminal identifier comprised in the access message sent by the base station and that comprised in the feedback message received by the base station in the same direction are identical, and are scrambled by the same TC-RNTI; the terminal identifiers comprised in at least two access messages are different. By implementing the embodiments of the present invention, the efficiency of random access can be improved.

Description

Random access method and base station Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a random access method and a base station.

Background technique

In a Long Term Evolution (LTE) network, a random access procedure refers to a process from when a user sends a random access preamble to try to access the network to establish a basic signaling connection with the network. The process is used in multiple events, especially in the process of cell handover, RRC (Radio Resource Control, RRC) connection control reestablishment, etc. Random access includes competitive random access and non-competitive random access. Access; see Figure 1, the contention of random access includes the following steps:

Step 1: The terminal uses the preamble Preamble to transmit the time-frequency resource. The terminal may determine a value of a random access radio network temporary identifier (RA-RNTI) based on the time-frequency resource of the Preamble, and use the value of the random access response (RAR) for the subsequent descrambling; The evolved base station (hereinafter referred to as "base station", English: evolved NodeB, eNB) receives the preamble transmitted by the terminal.

Step 2: The eNB sends the RAR. The RAR encapsulates a timing advance (TA), an RA-RNTI, a preamble, a backoff indicator (BI), a temporary cell radio network temporary identifier (TC-RNTI), and an uplink. a scheduling grant (UL grant); wherein the TA is used to calibrate the uplink timing; the RA-RNTI is calculated by the eNB according to the time-frequency resource of the received preamble, and is used to scramble the RAR; the preamble is received by the eNB. Preamble; BI specifies the time range that the terminal needs to wait before retransmitting the preamble; the UL grant is the uplink resource allocated by the eNB to the Msg3; the TC-RNTI is allocated to the eNB for the terminal and the eNodeB to scramble and decode in the subsequent transmission. .

Correspondingly, the terminal listens to the RAR in the RAR time window and decodes the RAR through its own RA-RNTI. If the decoding succeeds, the TA, preamble, BI, TC-RNTI and UL grant in the RAR are parsed; if in the RAR The preamble is the same as its preamble, and the RAR is determined to be sent to itself. If the preamble in the RAR is different from its preamble, the terminal retransmits the preamble based on the BI in the RAR (ie, re-execute step 1) .

Step 3: The terminal sends a message 3 (Msg3) on a Physical Uplink Shared Channel (PUSCH). The terminal transmits the Msg3 scrambled by the TC-RNTI based on the parsed TA calibration uplink timing, and the Msg3 includes the terminal identifier of the terminal (the terminal identifier may be the international mobile device identifier of the terminal (International Mobile Equipment) Identity, IMEI), randomly generated 40-bit identifier and other information that can be distinguished from other terminals); the terminal immediately starts the contention cancellation timer mac-ContentionResolutionTimer after transmitting the Msg3 message, and listens to the eNB to return to the specified time. Your own conflict resolution message Msg4. In the actual application process, multiple terminals may use the same time-frequency resource to send the same preamble in the first step, so that the multiple terminals can successfully decode the RAR sent by the eNB in the foregoing step 2. Each terminal sends Msg3 to the eNB in step 3, and these Msg3s are scrambled by the same TC-RNTI. Accordingly, the eNB can successfully decode these Msg3 based on its own TC-RNTI.

Step 4: The eNB sends Msg4, and the Msg4 is also scrambled by the TC-RNTI. Accordingly, the multiple terminals can successfully decode the Msg4 through their own TC-RNTI. However, only the target terminal can determine the terminal identifier in the Msg4. The target terminal is the same. Therefore, the target terminal upgrades the TC-RNTI to a cell radio network temporary identifier (C-RNTI) for subsequent interaction with the eNB, and sends an ACK to the eNB. The target terminal succeeds. Access to the network, while other terminals failed to access.

A disadvantage of the prior art is that among the plurality of terminals that use the same time-frequency resource to transmit the same preamble for random access, only one terminal can successfully access the network in the contention resolution, and the random access efficiency is low.

Summary of the invention

The embodiment of the invention discloses a random access method and a base station, which can improve the efficiency of random access.

In a first aspect, an embodiment of the present invention provides a random access method, where the method includes:

The base station receives the same preamble transmitted by the at least two terminals on the same time-frequency resource from the N different directions through the smart antenna, N≥2;

The base station sends a random access response to the N different directions by using the smart antenna, and the temporary cell radio network temporary identifier TC-RNTI used for scrambling in each of the random access responses is different;

Receiving, by the smart antenna, the feedback messages sent by each of the terminals after receiving the random access response, by using the smart antenna, and respectively, according to different TC-RNTIs, each of the received Feedback message solution And the feedback message includes a terminal identifier of the terminal that sends the feedback message, where the feedback message is sent by the terminal that sends the feedback message by using the received random access response. RNTI scrambling, M≥2;

The base station sends an access message including the terminal identifier to the M different directions by using the smart antenna, where the access message sent by the base station in the same direction and the received terminal included in the feedback message The identifiers are the same and are scrambled by the same TC-RNTI, and at least two of the access messages contain different terminal identifiers.

By performing the above steps, the base station performs a random access procedure through a different TC-RNTI based on the space division technology and the terminals in different directions in a random access procedure, so that the terminal having multiple directions in a random access procedure can access. In the mobile packet network, the efficiency of random access is improved.

In a second aspect, an embodiment of the present invention provides a random access method, where the method includes:

The base station receives the same preamble transmitted by the at least two terminals on the same time-frequency resource from the N different directions through the smart antenna, N≥2;

The base station sends a random access response to the N different directions by using the smart antenna, and the temporary cell radio network temporary identifier TC-RNTI for scrambling carried by each of the random access responses is the same;

Receiving, by the smart antenna, the feedback message sent by each of the terminals after receiving the random access response from the M different directions, and respectively receiving, according to the TC-RNTI, each received the feedback message The TC-RNTI carried by the terminal that sends the feedback message by the received random access response Scrambling, M≥2;

The base station sends an access message including the terminal identifier to the M different directions by using the smart antenna, where the feedback message and the access message are scrambled by the same TC-RNTI, and each of the access messages carries The cell radio network temporarily identifies the C-RNTI and the C-RNTI carried is different, and at least two of the access messages include different terminal identifiers.

By performing the above steps, the base station sends different T-RNTIs to terminals in different directions based on the space division technology in a random access procedure for subsequent communication between the terminal and the base station, so that the terminal has multiple directions in one random access procedure. It can access the mobile packet network and improve the efficiency of random access.

In a third aspect, an embodiment of the present invention provides a base station, where the base station includes a smart antenna, a memory, and a processor, where the processor invokes a random access procedure in the memory, to perform the following operations:

Receiving, by the smart antenna, the same before the at least two terminals transmitted on the same time-frequency resource from N different directions Guide code, N≥2;

Sending, by the smart antenna, a random access response to the N different directions, where the temporary cell radio network temporary identifier TC-RNTI for each of the random access responses is different;

Receiving, by the smart antenna, the feedback messages sent by each of the terminals after receiving the random access response, and respectively decoding the received feedback messages according to different TC-RNTIs And the feedback message includes a terminal identifier of the terminal that sends the feedback message, where the feedback message is sent by the terminal that sends the feedback message by using the received random access response. RNTI scrambling, M≥2;

Sending, by the smart antenna, an access message that includes a terminal identifier to the M different directions, where the access message sent by the base station in the same direction is the same as the terminal identifier included in the received feedback message, and Scrambled by the same TC-RNTI, at least two of the access messages contain different terminal identifiers.

By performing the above operations, the base station performs a random access procedure through different TC-RNTIs in a random access procedure based on the space division technology and the terminals in different directions, so that the terminal having multiple directions in a random access procedure can access. In the mobile packet network, the efficiency of random access is improved.

In a fourth aspect, an embodiment of the present invention provides a base station, where the base station includes a smart antenna, a memory, and a processor, where the processor invokes a random access procedure in the memory, to perform the following operations:

Receiving, by the smart antenna, the same preamble transmitted by the at least two terminals on the same time-frequency resource from N different directions, N≥2;

Transmitting a random access response to the N different directions by using the smart antenna, and the temporary cell radio network temporary identifier TC-RNTI for scrambling carried by each of the random access responses is the same;

Receiving, by the smart antenna, the feedback messages sent by each of the terminals after receiving the random access response, and descrambling the received feedback messages according to the TC-RNTI, The feedback message includes a terminal identifier of the terminal that sends the feedback message, and the feedback message is scrambled by the terminal that sends the feedback message by using the received TC-RNTI carried by the random access response. M≥2;

Sending, by the smart antenna, an access message including a terminal identifier to the M different directions, where the feedback message and the access message are scrambled by the same TC-RNTI, and each of the access messages carries a cell wireless The network temporarily identifies the C-RNTI and the C-RNTI carried is different, and at least two of the access messages include different terminal identifiers.

By performing the above operations, the base station sends the terminals in different directions based on the space division technology in a random access procedure. Different T-RNTIs are used for subsequent communication between the terminal and the base station, so that terminals with multiple directions in a random access procedure can access the mobile packet network, thereby improving the efficiency of random access.

In some possible implementation manners of the first aspect, the second aspect, the third aspect, and the fourth aspect, each of the access messages occupy different time-frequency resources.

Specifically, the access message is sent by using different time-frequency resources, which avoids interference between each access message, and improves the success rate of receiving and descrambling the access message by each terminal.

In some possible implementation manners of the first aspect, the second aspect, the third aspect, and the fourth aspect, each of the access messages includes a different terminal identifier.

Specifically, since each of the access messages includes different terminal identifiers, the access messages sent to a certain terminal are not repeatedly transmitted, which reduces the overhead of the base station.

In some possible implementation manners of the first aspect and the second aspect, each of the random access responses occupies different time-frequency resources.

Specifically, the random access response is sent by using different time-frequency resources, which avoids interference between each random access response, and improves the success rate of receiving and descrambling random access responses of each terminal.

In a first aspect and some possible implementations of the second aspect, each of the access messages are each scrambled by a different TC-RNTI. Specifically, since each of the access messages is scrambled by a different TC-RNTI, the same TC-RNTI is not granted to multiple terminals, and multiple terminals are prevented from communicating with the base station by using the same TC-RNTI. Interference.

In a fifth aspect, an embodiment of the present invention provides a base station, where the base station includes a functional unit for performing some or all of the steps of any implementation manner of the first aspect of the embodiments of the present invention.

In a sixth aspect, an embodiment of the present invention provides a base station, where the base station includes a functional unit for performing some or all of the steps of any implementation manner of the second aspect of the embodiment of the present invention.

By implementing the embodiment of the present invention, the base station performs a random access procedure by using different TC-RNTIs in a random access process based on the space division technology and the terminals in different directions, so that the terminal having multiple directions in a random access process can Access to the mobile packet network improves the efficiency of random access.

DRAWINGS

1 is a schematic flow chart of a random access method in the prior art;

2 is a schematic flowchart of a random access method according to an embodiment of the present invention;

2A is a schematic diagram of a random access scenario according to an embodiment of the present invention;

2B is a schematic diagram of another random access scenario according to an embodiment of the present disclosure;

FIG. 3 is a schematic flowchart diagram of still another random access method according to an embodiment of the present disclosure;

3A is a schematic diagram of another random access scenario according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of still another base station according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of still another base station according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of still another base station according to an embodiment of the present invention.

detailed description

The terminal involved in the embodiments of the present invention may include a handheld device having a wireless communication function, an in-vehicle device, a wearable device, a computing device, or other processing device connected to the wireless modem, and various forms of user equipment (User Equipment, referred to as UE), a mobile station (MS), a terminal, a terminal equipment, and the like. For convenience of description, the present application is simply referred to as a terminal, and the terminal is within the signal coverage of the base station.

The technical solution of the present invention will be clearly described below with reference to the accompanying drawings, wherein Figures 2 to 3 are used to describe the method of the embodiment of the present invention.

2 is a schematic flowchart of a random access method according to an embodiment of the present invention. Describes that a base station receives a random access request sent by multiple terminals from multiple directions through a smart antenna, and allocates different TC-RNTIs in multiple directions, so that terminals in all directions access the mobile packet through different TC-RNTIs. The scheme of the network is described in detail below by steps S201 to S206.

Step S201: A plurality of terminals send the same preamble to the base station through the same time-frequency resource to request access to the mobile packet network.

Specifically, the plurality of terminals are a plurality of terminals within the coverage of the base station signal, and the terminals select the same preamble from the plurality of preambles provided by the communication protocol during random access, and select the same time The frequency resource is used to transmit the preamble.

Step S202: The base station receives the same preamble transmitted by the at least two terminals on the same time-frequency resource from the N different directions through the smart antenna, where N≥2.

Specifically, the smart antenna in the embodiment of the present invention may be an antenna array, and the weighting of the array elements in the antenna array may generate N beams with directivity, and the radiation range of each beam is the signal coverage of the smart antenna. range. If the smart antenna forms N beams pointing in different directions, the smart antenna can receive signals from terminals in the corresponding beam radiation range from the N different directions, or can transmit signals to the N different directions to make corresponding beam radiation. The terminal in the range receives the signal, and the above N is a positive integer not less than 2.

It should be noted that, in actual operation, in addition to receiving the preamble from the N directions, the base station may try to receive the preamble from other directions, but the signal is attenuated during the transmission due to the preamble in the other direction, or In the other direction, the signal of the preamble is not sent at all, and the base station does not send the random access response to the direction subsequently. Therefore, in step S202, only the base station receives the preamble from the N directions through the smart antenna, and the description is not described. Other directions.

2A is a schematic diagram of a random access scenario according to an embodiment of the present invention; the base station 100 can form beams 121-124 through a smart antenna, and each beam points in a different direction; the terminal 111 is within the radiation range of the beam 121, and the terminal 112 is in the beam. In the radiation range of 122, the terminal 113 is within the radiation range of the beam 123, and the terminal 114 is within the radiation range of the beam 124; the base station 100 can transmit signals to the terminal 111, the terminal 112, the terminal 113, and the terminal 114 in different directions, respectively. Signals transmitted from the terminal 111, the terminal 112, the terminal 113, and the terminal 114 from the different directions are received, respectively.

Step S203: The base station sends a random access response to the N different directions by using the smart antenna, and the temporary cell wireless network temporary identifier TC-RNTI for each of the random access responses is different.

Specifically, after receiving the preamble from the N directions, the base station sends a random access response to the N directions, where the smart antenna sends one random access response to each of the N directions. Each random access response sent is scrambled by the RA-RNTI corresponding to the time-frequency resource (the base station and the terminal can calculate the RA-RNTI through the time-frequency resource); each random access response includes different TC-RNTI.

In an optional solution, each of the random access responses occupies different time-frequency resources.

Specifically, when the base station sends a random access response to the N directions, the random access response sent to each direction is dispersed and transmitted on different time-frequency resources, so as to prevent the terminal from receiving different random access responses at the same time and generating interference. .

In still another optional solution, when the base station sends a random access response to the N directions, the time advance TA included in each random access response is calculated according to the preamble received in the corresponding direction, and N is assumed. The direction includes the direction A and the direction B, and the TA in the random access response sent by the base station to the direction A is calculated according to the information of receiving the preamble from the direction A, and the TA in the random access response sent by the base station to the direction B is It is calculated based on the information of the preamble received from the direction B; that is, the TA in the random access response transmitted to the direction A may be the same as or different from the TA in the random access response transmitted in the direction B.

Step S204: Each terminal that sends the same preamble through the same time-frequency resource receives the random access response in the time window, and sends a feedback message to the base station when determining the response to the random access response.

Specifically, after the foregoing time-frequency resource sends the preamble, each terminal detects whether there is a random access response sent to itself in the time window; each terminal sends the above by itself when receiving the random access response. The RA-RATI corresponding to the time-frequency resource used by the preamble (the base station and the terminal can calculate the RA-RNTI through the time-frequency resource described above) to descramble the random access response, and if the descrambling is successful, the random access is determined. Whether the preamble in the response is the same as the preamble sent by itself, and if they are all the same, it is determined that the random access response is sent to itself.

In practical applications, when the terminal is in the radiation range of the beam in a certain direction, it is possible to receive the random access response sent by the base station to the direction, if the radiation range of the beam in different directions is used in the multiple terminals If the terminal receives the random access response sent by the base station, and each terminal determines that the received random access response is sent to itself (because each terminal can calculate the RA based on the time-frequency resource) RNTI). Therefore, the terminal sends a feedback message (such as Msg3) to the base station, and the feedback message sent by each terminal includes the terminal identifier of the terminal (the terminal identifier can be the IMEI of the terminal, the randomly generated 40-bit identifier, etc. can be performed with other terminals. Distinguished information), the feedback message is scrambled by the TC-RNTI in the random access response received by the terminal.

It should be noted that if a terminal is in the radiation range of the beam in multiple directions formed by the smart antenna, the random access response sent by the base station to the multiple directions may be received by the terminal, and the terminal sends After the feedback message, the base station can also receive the feedback message from the multiple directions through the smart antenna and successfully descramble. In addition, the terminal is not in the radiation range of the beam in a certain direction, but the random access response sent by the base station to the certain direction may be received by the terminal after being reflected by the obstacle, and the terminal sends a feedback message. The reflection of the obstacle may also be received by the base station and successfully descrambled; for details, refer to the scenario diagram 2B. In FIG. 2B, the base station 200 sends a feedback message to a certain direction through the smart antenna, although the terminal 210 is not in the direction of the beam. Radiation range, but sent The feedback message is reflected by the obstacle 240 and can be received by the terminal 210.

Step S205: The base station receives the feedback message sent by each of the terminals after receiving the random access response from the M different directions by using the smart antenna, and separately receives the received message according to different TC-RNTIs. Each of the feedback messages is descrambled, and the feedback message includes a terminal identifier of the terminal that sends the feedback message, and the feedback message is received by the terminal that sends the feedback message by using the received random access response. The carried TC-RNTI is scrambled, M≥2.

Specifically, the base station receives the feedback message from the M different directions through the smart antenna, where M is a positive integer not less than 2. After receiving the feedback message, the base station sequentially descrambles each feedback message by using multiple previously reserved TC-RNTIs. The reserved multiple TC-RNTIs are allocated to the TC-RNTIs of the respective random access responses when the base station sends the random access response, and each of the foregoing feedback messages may be solved by the TC-RNTI in the multiple TC-RNTIs. Disturb.

It should be noted that, in actual operation, in addition to receiving the feedback message from the M directions, the base station may try to receive the feedback message from other directions, but the signal is attenuated during the transmission due to the feedback message in the other direction, or After receiving the signal, the signal cannot be successfully descrambled, or the signal in the other direction is not sent at all, so that the base station does not send the access message to the direction subsequently. Therefore, in step S205, only the base station is described from the M direction through the smart antenna. The feedback message was received without describing the other directions.

It should be noted that the N different directions described in step S202 may be the same as or different from the M different directions described in step S205. If the base station adjusts the beam formed by the smart antenna in real time according to the communication situation with the surrounding terminal, The N different directions described in step S202 may be different from the M different directions described in step S205. If the base station does not adjust the beam formed by the smart antenna, the N different directions described in step S202 are described in step S205. The M different directions are the same; the base station can normally receive the foregoing preamble in step S202, and the feedback message is normally received in step S205, regardless of whether the directions indicated by the N different directions and the M different directions are the same.

Step S206: The base station sends an access message including the terminal identifier to the M different directions by using the smart antenna, where the access message sent by the base station in the same direction and the received feedback message are included. The terminal identifiers are the same and are scrambled by the same TC-RNTI, and at least two of the access messages include different terminal identifiers.

Specifically, after the base station successfully descrambles the feedback message, it needs to send an access message (such as Msg4) according to the feedback message to notify the terminal that the mobile packet network has been successfully accessed. Specifically, the smart antenna transmits the access cancellation to M different directions. The access messages sent in all directions are each scrambled by different TC-RNTIs. After receiving the message 3 from a certain direction and successfully descrambling, the base station sends an access message to the certain direction, and the feedback message and the access message include the same terminal identifier, and are scrambled by the same TC-RNTI, but only Scrambling the feedback message is the terminal that sent the feedback message, and the base station is scrambled for the access message. For example, if the base station receives the feedback message from the direction A through the smart antenna, and the feedback message is successfully descrambled by the base station, the base station sends an access message to the direction A, where the access message includes the terminal identifier in the feedback message. And scrambling the access message by a TC-RNTI that scrambles the feedback message.

In an optional solution, each of the access messages includes a different terminal identifier. Specifically, when the feedback message sent by the same terminal is received from multiple directions, the access message is sent only to one of the multiple directions, and the overhead of the base station can be reduced.

In yet another alternative, each of the access messages is scrambled by a different TC-RNTI.

For example, when the base station descrambles the feedback message received from direction A, the feedback message received from direction B, and the feedback message received from direction C based on the same TC-RNTI, finally only direction A, direction B, and An access message is sent to one of the directions C.

In still another optional solution, each of the access messages occupies different time-frequency resources.

Specifically, when the base station sends an access message to the M directions through the smart antenna, the access messages sent in the respective directions may be allocated to be transmitted on different time-frequency resources, so as to prevent the terminal from receiving different access messages at the same time. interference.

Step S207: Each terminal that sends the feedback message receives the access message, and determines, according to the access message, whether it has successfully accessed the mobile packet network, and if so, performs network communication based on the TC-RNTI.

Specifically, each of the foregoing terminals receives the access message, and descrambles the access message with the TC-RNTI that previously scrambles the feedback message, if the descrambling is successful, and determines that the terminal identifier in the access message is its own terminal. When marking, make sure that you are connected to the mobile packet network. Then, the terminal upgrades the TC-RNTI of the scrambled feedback message to the C-RNTI for use in subsequent communication with the base station. In this step, multiple terminals successfully descramble the access message, and determine that the terminal identifier in the received access message is the same as its own terminal identifier. Therefore, multiple terminals upgrade the TC-RNTI to C. - RNTI, and the C-RNTI obtained by at least two terminal upgrades is different.

By implementing the present embodiment, the base station performs a random access procedure by using different TC-RNTIs in a random access procedure based on the space division technology and the terminals in different directions, so that terminals in multiple directions can be connected in one random access procedure. Enter In the mobile packet network, the efficiency of random access is improved.

FIG. 3 is a schematic flowchart diagram of still another random access method according to an embodiment of the present invention. Describes that a base station receives a random access request sent by multiple terminals from multiple directions through a smart antenna, and allocates different C-RNTIs in multiple directions, so that terminals in all directions access the mobile packet network through different TC-RNTIs. The scheme is described in detail below by steps S301 to S306.

Step S301: A plurality of terminals send the same preamble to the base station by using the same time-frequency resource to request access to the network.

Specifically, the plurality of terminals are a plurality of terminals within the coverage of the base station signal, and the terminals select the same preamble from the plurality of preambles provided by the communication protocol during random access, and select the same time The frequency resource is used to transmit the preamble. Step S301 is the same as step S201.

Step S302: The base station receives the same preamble transmitted by the at least two terminals on the same time-frequency resource from the N different directions through the smart antenna, where N≥2.

Specifically, the smart antenna in the embodiment of the present invention may be an antenna array, and the weighting of the array elements in the antenna array may generate N beams with directivity, and the radiation range of each beam is the signal coverage of the smart antenna. range. If the smart antenna forms N beams pointing in different directions, the smart antenna can receive signals from terminals in the corresponding beam radiation range from the N different directions, or can transmit signals to the N different directions to make corresponding beam radiation. The terminal in the range receives the signal, and the above N is a positive integer not less than 2.

It should be noted that, in actual operation, in addition to receiving the preamble from the N directions, the base station may try to receive the preamble from other directions, but the signal is attenuated during the transmission due to the preamble in the other direction, or In the other direction, the signal of the preamble is not sent at all, and the base station does not send the random access response to the direction subsequently. Therefore, in step S202, only the base station receives the preamble from the N directions through the smart antenna, and the description is not described. Other directions. FIG. 2A is a schematic diagram of a scenario of random access according to an embodiment of the present invention. A related description of the scenario is provided in the foregoing, and details are not described herein again. Step S302 is the same as step S202.

Step S303: The base station sends a random access response to the N different directions by using the smart antenna, and the temporary cell radio network temporary identifier TC-RNTI for scrambling carried in each of the random access responses is the same.

Specifically, after receiving the preamble from the N directions, the base station sends a random access response to the N directions, where the smart antenna sends one random access response to each of the N directions. Each random sent The access response is scrambled by the RA-RNTI corresponding to the time-frequency resource (the base station and the terminal can calculate the RA-RNTI through the time-frequency resource), and the random access response sent in each direction includes the same TC- RNTI.

In an optional solution, the TAs in the random access response sent by the base station to the N directions may be the same or different, and the specific principles are not described herein again.

Step S304: Each terminal that transmits the same preamble through the same time-frequency resource receives the random access response in the time window, and sends a feedback message to the base station when determining the response to the random access response.

Specifically, after the foregoing time-frequency resource sends the preamble, each terminal detects whether there is a random access response sent to itself in the time window; each terminal sends the above by itself when receiving the random access response. The RA-RATI corresponding to the time-frequency resource used by the preamble (the base station and the terminal can calculate the RA-RNTI through the time-frequency resource described above) to descramble the random access response, and if the descrambling is successful, the random access is determined. Whether the preamble in the response is the same as the preamble sent by itself, and if they are all the same, it is determined that the random access response is sent to itself.

In practical applications, when the terminal is in the radiation range of the beam in a certain direction, it is possible to receive the random access response sent by the base station to the direction, if the radiation range of the beam in different directions is used in the multiple terminals If the terminal receives the random access response sent by the base station, and each terminal determines that the received random access response is sent to itself (because each terminal can calculate the RA based on the time-frequency resource) RNTI). Therefore, the terminal sends a feedback message (such as Msg3) to the base station, and the feedback message sent by each terminal includes the terminal identifier of the terminal (the terminal identifier can be the IMEI of the terminal, the randomly generated 40-bit identifier, etc. can be performed with other terminals. Distinguished information), the feedback message is scrambled by the TC-RNTI in the random access response received by the terminal.

It should be noted that if a terminal is in the radiation range of the beam in multiple directions formed by the smart antenna, the random access response sent by the base station to the multiple directions may be received by the terminal, and the terminal sends After the feedback message, the base station can also receive the feedback message from the multiple directions through the smart antenna and successfully descramble; in addition, the terminal is not in the radiation range of the beam in a certain direction, but the base station is to the certain The random access response of the transmitted direction may be received by the terminal after being reflected by the obstacle. The feedback message sent by the terminal may be received by the base station and successfully descrambled by the obstacle. For details, refer to the scenario diagram 3A. The base station 300 in FIG. 3A sends a feedback message to a certain direction through the smart antenna. Although the terminal 310 is not within the radiation range of the beam in a certain direction, the transmitted feedback message is reflected by the obstacle 340 and can be received by the terminal 310.

Step S305: The base station receives, by the smart antenna, Ms from different directions to receive each terminal. The feedback message sent after the random access response is sent, and the received feedback message is descrambled according to the TC-RNTI, where the feedback message includes the terminal identifier of the terminal that sends the feedback message, and the feedback The message is scrambled by the terminal that sends the feedback message by the received TC-RNTI carried by the random access response, M≥2.

Specifically, the base station receives the feedback message from the M different directions through the smart antenna, where M is a positive integer not less than 2. After receiving the feedback message, the base station encapsulates the TC-RNTI encapsulated in the random access response when the random access response is sent before. De-scrambling the feedback message; wherein each feedback message includes a terminal identifier, and the terminal information of which terminal is included by which terminal is sent by the feedback message; it should be noted that the base station may also try to receive the feedback message from other directions, but In this step, only the case where the feedback message is received from the M directions is described. The specific principle is not described here. Further, the directions of the N different directions and the different directions of the M may be the same or different, and the specific principles are not described herein again.

Step S306: The base station sends an access message including the terminal identifier to the M different directions by using the smart antenna, where the feedback message and the access message are scrambled by the same TC-RNTI, and each of the The incoming message carries a cell radio network temporary identifier C-RNTI and the C-RNTI carried is different, and at least two of the access messages include different terminal identifiers.

Specifically, after the base station successfully descrambles the feedback message, it needs to send an access message (such as Msg4) according to the feedback message to notify the terminal that the mobile packet network has been successfully accessed. Specifically, the smart antenna transmits an access message to M different directions. For example, if a feedback message is received through the beam A, and the feedback message is successfully descrambled by the base station, the base station sends an access message through the beam A, where the access message includes the terminal identifier in the feedback message, and the base station The C-RNTI allocated for the access message is also scrambled by the TC-RNTI scrambled for the feedback message. It should be noted that the C-RNTIs included in each access message are different, and the access messages included in at least two directions contain different terminal identifiers. Further, a field may be added to the access message to indicate the C-RNTI by modifying the existing protocol.

In an optional solution, each of the access messages includes a different terminal identifier. Specifically, when the feedback message sent by the same terminal is received from multiple directions, the access message is sent only to one of the multiple directions, and the overhead of the base station can be reduced.

In still another optional solution, each of the access messages occupies different time-frequency resources.

Specifically, when the base station sends an access message to the M directions through the smart antenna, the access cancellation sent in each direction The information can be allocated to be transmitted on different time-frequency resources to prevent the terminal from receiving interference by receiving different access messages at the same time.

Step S307: Each terminal that sends the feedback message receives the access message, and determines whether it has successfully accessed the mobile packet network according to the access message, and if so, performs network communication based on the TC-RNTI.

Specifically, each of the foregoing terminals receives the access message, and descrambles the access message with the TC-RNTI that previously scrambles the feedback message, if the descrambling is successful, and determines that the terminal identifier in the access message is its own terminal. When marking, it is determined that it has accessed the mobile packet network, and thus, the terminal can communicate with the base station by using the C-RNTI in the access message. In this step, multiple terminals successfully descramble the access message, and determine that the terminal identifier in the received access message is the same as the terminal identifier of the terminal, so that multiple terminals can obtain the C-RNTI. The C-RNTI obtained by each terminal is different.

By implementing the present embodiment, the base station sends different T-RNTIs to terminals in different directions based on the space division technology in a random access procedure for subsequent communication between the terminal and the base station, so that multiple directions are used in a random access procedure. The terminal can access the mobile packet network, which improves the efficiency of random access.

The method of the embodiment of the present invention is described in detail above with reference to FIGS. 2 to 3. In order to facilitate the implementation of the solution of the embodiment of the present invention, the device of the embodiment of the present invention is described in detail below with reference to FIGS.

FIG. 4 is a schematic structural diagram of a base station 40 according to an embodiment of the present invention; the base station 40 may include a smart antenna 401, a memory 402, a processor 403, a receiving circuit 405, and a sending circuit 406. The processor 403 may be one or A plurality of processors, for example, in FIG. 4, a smart antenna 401, a receiving circuit 405, a transmitting circuit 406, a memory 402, and a processor 403 are respectively connected to a bus 404, wherein the memory 402 stores a set of random access control. Program code, and the processor 403 is configured to call the program code for controlling random access stored in the memory 402 to perform the following operations:

Controlling, by the smart antenna 401, the receiving, by the smart antenna 401, the same preamble that the at least two terminals send on the same time-frequency resource from N different directions, N≥2;

The transmitting circuit 406 is configured to send a random access response to the N different directions by using the smart antenna 401, and the temporary cell radio network temporary identifier TC-RNTI for scrambling carried by each of the random access responses is different;

The receiving circuit 405 receives, through the smart antenna 401, the feedback messages sent by each of the terminals after receiving the random access response from the M different directions, and respectively receives the feedback messages based on different TC-RNTIs. Each The feedback message is descrambled, and the feedback message includes a terminal identifier of the terminal that sends the feedback message, and the feedback message is received by the terminal that sends the feedback message by using the received random access response. Carrying the TC-RNTI to be scrambled, M≥2;

Controlling, by the smart antenna 401, the sending, by the smart circuit 401, an access message including a terminal identifier, where the access message sent by the base station in the same direction and the received feedback message are included The terminal identifiers are the same and are scrambled by the same TC-RNTI, and at least two of the access messages include different terminal identifiers.

By performing the above operations, the base station performs a random access procedure through different TC-RNTIs in a random access procedure based on the space division technology and the terminals in different directions, so that the terminal having multiple directions in a random access procedure can access. In the mobile packet network, the efficiency of random access is improved.

In an optional solution, each of the random access responses occupies different time-frequency resources.

Specifically, the random access response is sent by using different time-frequency resources, which avoids interference between each random access response, and improves the success rate of receiving and descrambling random access responses of each terminal.

In still another optional solution, each of the access messages occupies different time-frequency resources.

Specifically, the access message is sent by using different time-frequency resources, which avoids interference between each access message, and improves the success rate of receiving and descrambling the access message by each terminal.

In still another optional solution, each of the access messages includes a different terminal identifier.

Specifically, since each of the access messages includes different terminal identifiers, the access messages sent to a certain terminal are not repeatedly transmitted, which reduces the overhead of the base station.

In yet another alternative, each of the access messages is scrambled by a different TC-RNTI.

Specifically, since each of the access messages is scrambled by a different TC-RNTI, the same TC-RNTI is not granted to multiple terminals, and multiple terminals are prevented from communicating with the base station by using the same TC-RNTI. Interference.

It should be noted that the specific implementation of the base station 40 in the embodiment of FIG. 4 may also correspond to the corresponding description of the method embodiment shown in FIG. 2 .

FIG. 5 is a schematic structural diagram of still another base station 50 according to an embodiment of the present invention; the base station 50 may include a smart antenna 501, a memory 502, a processor 503, a receiving circuit 505, and a sending circuit 506 (the processor 503 may be one or For example, a smart processor 501, a memory 502, a processor 503, a receiving circuit 505, and a transmitting circuit 506 are respectively connected to the bus 504, wherein the memory 502 stores a set of control random connections. The program code is entered, and the processor 503 is configured to call the program code for controlling random access stored in the memory 502 to perform the following operations:

The control receiving circuit 505 receives the same preamble transmitted by the at least two terminals on the same time-frequency resource from the N different directions through the smart antenna 501, N≥2;

The control sending circuit 506 sends a random access response to the N different directions through the smart antenna 501, and the temporary cell radio network temporary identifier TC-RNTI for scrambling carried by each of the random access responses is the same;

The control receiving circuit 505 receives the feedback message sent by each of the terminals after receiving the random access response from the M different directions through the smart antenna 501, and respectively respectively, according to the TC-RNTI, the received Defeeding the feedback message, the feedback message includes a terminal identifier of the terminal that sends the feedback message, and the feedback message is sent by the terminal that sends the feedback message by using the received random access response -RNTI scrambling, M≥2;

The control sending circuit 506 transmits an access message including the terminal identifier to the M different directions through the smart antenna 501, and the feedback message and the access message are scrambled by the same TC-RNTI, and each of the access messages The message carries a cell radio network temporary identifier C-RNTI and the C-RNTI carried is different, and at least two of the access messages include different terminal identifiers.

By performing the foregoing operations, the base station sends different T-RNTIs to terminals in different directions based on the space division technology in a random access procedure for subsequent communication between the terminal and the base station, so that the terminal has multiple directions in one random access procedure. It can access the mobile packet network and improve the efficiency of random access.

In an optional solution, each of the access messages occupies different time-frequency resources.

Specifically, the access message is sent by using different time-frequency resources, which avoids interference between each access message, and improves the success rate of receiving and descrambling the access message by each terminal.

In still another optional solution, each of the access messages includes a different terminal identifier.

Specifically, since each of the access messages includes different terminal identifiers, the access messages sent to a certain terminal are not repeatedly transmitted, which reduces the overhead of the base station.

It should be noted that the specific implementation of the base station 50 in the embodiment of FIG. 5 may also correspond to the corresponding description of the method embodiment shown in FIG. 3.

FIG. 6 is a schematic structural diagram of still another base station 60 according to an embodiment of the present invention; the base station 60 includes a first receiving list. Element 601, first transmitting unit 602, second receiving unit 603, and second transmitting unit 604, the detailed description of each unit is as follows:

The first receiving unit 601 is configured to receive, by using the smart antenna, the same preamble that is sent by the at least two terminals on the same time-frequency resource from N different directions, where N≥2;

The first sending unit 602 is configured to send, by using the smart antenna, a random access response to the N different directions, where the temporary cell radio network temporary identifier TC-RNTI for each of the random access responses is different;

The second receiving unit 603 is configured to receive, by using the smart antenna, the feedback messages sent by each of the terminals after receiving the random access response from the M different directions, and respectively receive the received messages according to different TC-RNTIs. Each of the feedback messages is descrambled, and the feedback message includes a terminal identifier of the terminal that sends the feedback message, and the feedback message is received by the terminal that sends the feedback message by using the random access Responding to the TC-RNTI scrambling carried, M≥2;

The second sending unit 604 is configured to send, by using the smart antenna, an access message that includes a terminal identifier to the M different directions, where the access message sent by the base station in the same direction and the received feedback message include The terminal identifiers are the same and are scrambled by the same TC-RNTI, and at least two of the access messages include different terminal identifiers.

By performing the foregoing unit, the base station performs a random access procedure by using different TC-RNTIs in a random access procedure based on the space division technology and the terminals in different directions, so that the terminal having multiple directions in a random access procedure can access. In the mobile packet network, the efficiency of random access is improved.

In an optional solution, each of the random access responses occupies different time-frequency resources.

Specifically, the random access response is sent by using different time-frequency resources, which avoids interference between each random access response, and improves the success rate of receiving and descrambling random access responses of each terminal.

In still another optional solution, each of the access messages occupies different time-frequency resources.

Specifically, the access message is sent by using different time-frequency resources, which avoids interference between each access message, and improves the success rate of receiving and descrambling the access message by each terminal.

In still another optional solution, each of the access messages includes a different terminal identifier.

Specifically, since each of the access messages includes different terminal identifiers, the access messages sent to a certain terminal are not repeatedly transmitted, which reduces the overhead of the base station.

In yet another alternative, each of the access messages is scrambled by a different TC-RNTI.

Specifically, since each of the access messages is scrambled by a different TC-RNTI, the same TC-RNTI is not granted to multiple terminals, and multiple terminals are prevented from communicating with the base station by using the same TC-RNTI. Interference.

It should be noted that the specific implementation of the base station 60 in the embodiment of FIG. 6 may also correspond to the corresponding description of the method embodiment shown in FIG. 2 .

FIG. 7 is a schematic structural diagram of still another base station 70 according to an embodiment of the present invention; the base station 70 includes a first receiving unit 701, a first sending unit 702, a second receiving unit 703, and a second sending unit 704, and details of each unit Described as follows:

The first receiving unit 701 is configured to receive, by using a smart antenna, the same preamble that is sent by the at least two terminals on the same time-frequency resource from N different directions, where N≥2;

The first sending unit 702 is configured to send, by using the smart antenna, a random access response to the N different directions, where each of the random access responses carries the same temporary cell radio network temporary identifier TC-RNTI for scrambling;

The second receiving unit 703 is configured to receive, by using the smart antenna, the feedback messages sent by each of the terminals after receiving the random access response from the M different directions, and respectively, according to the TC-RNTI, each received The feedback message is descrambled, and the feedback message includes a terminal identifier of a terminal that sends the feedback message, where the feedback message is carried by the terminal that sends the feedback message by using the received random access response. TC-RNTI scrambling, M≥2;

The second sending unit 704 is configured to send, by using the smart antenna, an access message including a terminal identifier to the M different directions, where the feedback message and the access message are scrambled by the same TC-RNTI, and each of the foregoing The access message carries the cell radio network temporary identifier C-RNTI and the C-RNTI carried is different, and at least two of the access messages include different terminal identifiers.

By performing the foregoing unit, the base station sends different T-RNTIs to the terminals in different directions based on the space division technology in a random access procedure for subsequent communication between the terminal and the base station, so that the terminal has multiple directions in one random access procedure. It can access the mobile packet network and improve the efficiency of random access.

In an optional solution, each of the access messages occupies different time-frequency resources.

Specifically, the access message is sent by using different time-frequency resources, which avoids interference between each access message, and improves the success rate of receiving and descrambling the access message by each terminal.

In still another optional solution, each of the access messages includes a different terminal identifier.

Specifically, since each of the access messages includes different terminal identifiers, the access messages sent to a certain terminal are not repeatedly transmitted, which reduces the overhead of the base station.

It should be noted that the specific implementation of the base station 70 in the embodiment of FIG. 7 may also correspond to the corresponding description of the method embodiment shown in FIG. 3.

In summary, by implementing the embodiment of the present invention, a base station performs a random access procedure by using a space division technology and a terminal in different directions through different TC-RNTIs in a random access procedure, so that there is a random access procedure. Terminals in all directions can access the mobile packet network, which improves the efficiency of random access.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, the flow of an embodiment of the methods as described above may be included. The foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

The above embodiments are only illustrative of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and those skilled in the art can understand all or part of the processes for implementing the above embodiments, and according to the claims of the present invention. Equivalent changes are still within the scope of the invention.

Claims (16)

A random access method, comprising: The base station receives the same preamble transmitted by the at least two terminals on the same time-frequency resource from the N different directions through the smart antenna, N≥2; The base station sends a random access response to the N different directions by using the smart antenna, and the temporary cell radio network temporary identifier TC-RNTI used for scrambling in each of the random access responses is different; Receiving, by the smart antenna, the feedback messages sent by each of the terminals after receiving the random access response, by using the smart antenna, and respectively, according to different TC-RNTIs, each of the received The feedback message is descrambled, and the feedback message includes a terminal identifier of the terminal that sends the feedback message, where the feedback message is carried by the terminal that sends the feedback message by using the received random access response. TC-RNTI scrambling, M≥2; The base station sends an access message including the terminal identifier to the M different directions by using the smart antenna, where the access message sent by the base station in the same direction and the received terminal included in the feedback message The identifiers are the same and are scrambled by the same TC-RNTI, and at least two of the access messages contain different terminal identifiers. The method according to claim 1, wherein each of the random access responses occupies different time-frequency resources. The method according to claim 1 or 2, wherein each of the access messages occupies different time-frequency resources. The method according to any one of claims 1 to 3, characterized in that each of the access messages comprises different terminal identifiers. The method according to any one of claims 1 to 3, characterized in that each of the access messages is scrambled by a different TC-RNTI. A random access method, comprising: The base station receives the same preamble transmitted by the at least two terminals on the same time-frequency resource from the N different directions through the smart antenna, N≥2; The base station sends a random access response to the N different directions by using the smart antenna, and the temporary cell radio network temporary identifier TC-RNTI for scrambling carried by each of the random access responses is the same; Receiving, by the base station, the respective terminals from the M different directions through the smart antenna, receiving the random access Responding to the received feedback message, and descrambling each of the received feedback messages based on the TC-RNTI, the feedback message includes a terminal identifier of the terminal that sends the feedback message, and the feedback message is sent by the sending station. The terminal of the feedback message is scrambled by the received TC-RNTI carried by the random access response, M≥2; The base station sends an access message including the terminal identifier to the M different directions by using the smart antenna, where the feedback message and the access message are scrambled by the same TC-RNTI, and each of the access messages carries The cell radio network temporarily identifies the C-RNTI and the C-RNTI carried is different, and at least two of the access messages include different terminal identifiers. The method according to claim 6, wherein each of the access messages occupies different time-frequency resources. The method according to claim 6 or 7, wherein each of the access messages comprises a different terminal identity. A base station, comprising: a smart antenna, a memory and a processor, wherein the processor invokes a random access procedure in the memory for performing the following operations: Receiving, by the smart antenna, the same preamble transmitted by the at least two terminals on the same time-frequency resource from N different directions, N≥2; Sending, by the smart antenna, a random access response to the N different directions, where the temporary cell radio network temporary identifier TC-RNTI for each of the random access responses is different; Receiving, by the smart antenna, the feedback messages sent by each of the terminals after receiving the random access response, and respectively decoding the received feedback messages according to different TC-RNTIs And the feedback message includes a terminal identifier of the terminal that sends the feedback message, where the feedback message is sent by the terminal that sends the feedback message by using the received random access response. RNTI scrambling, M≥2; Sending, by the smart antenna, an access message that includes a terminal identifier to the M different directions, where the access message sent by the base station in the same direction is the same as the terminal identifier included in the received feedback message, and Scrambled by the same TC-RNTI, at least two of the access messages contain different terminal identifiers. The base station according to claim 9, wherein each of the random access responses occupies different time-frequency resources. The base station according to claim 9 or 10, characterized in that each of the access messages occupies different time-frequency resources. The base station according to any one of claims 9 to 11, wherein each of the access messages includes a different terminal identifier. The base station according to any one of claims 9 to 11, characterized in that each of the access messages is scrambled by a different TC-RNTI. A base station, comprising: a smart antenna, a memory and a processor, wherein the processor invokes a random access procedure in the memory for performing the following operations: Receiving, by the smart antenna, the same preamble transmitted by the at least two terminals on the same time-frequency resource from N different directions, N≥2; Transmitting a random access response to the N different directions by using the smart antenna, and the temporary cell radio network temporary identifier TC-RNTI for scrambling carried by each of the random access responses is the same; Receiving, by the smart antenna, the feedback messages sent by each of the terminals after receiving the random access response, and descrambling the received feedback messages according to the TC-RNTI, The feedback message includes a terminal identifier of the terminal that sends the feedback message, and the feedback message is scrambled by the terminal that sends the feedback message by using the received TC-RNTI carried by the random access response. M≥2; Sending, by the smart antenna, an access message including a terminal identifier to the M different directions, where the feedback message and the access message are scrambled by the same TC-RNTI, and each of the access messages carries a cell wireless The network temporarily identifies the C-RNTI and the C-RNTI carried is different, and at least two of the access messages include different terminal identifiers. The base station according to claim 14, wherein each of the access messages occupies different time-frequency resources. The base station according to claim 14 or 15, wherein each of the access messages includes a different terminal identifier.

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