CN104754758A - Random access method, user equipment, base station and system - Google Patents
Random access method, user equipment, base station and system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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Abstract
The invention provides a random access method. The method comprises the following steps: transmitting a randomly-selected random access preamble; and receiving a random access response message, and if a conflict indication area in the random access response message indicates that a conflict occurs, ending a current random access process, and retransmitting a randomly-reselected random access preamble; alternatively, if the conflict indication area in the random access response message indicates that the conflict occurs, judging the priority of current random access, and if the priority is high, sending a random access message 3, and continuing the current random access process, otherwise, ending the current random access process, and retransmitting the randomly-reselected random access preamble. Through adoption of the method, the random access delay can be reduced, and the power consumption of user equipment is saved.
Description
Technical Field
The present invention relates to a random access method, and more particularly, to a random access method and system based on contention.
Background
LTE (Long Term Evolution) is a Long Term Evolution of UMTS (universal mobile Telecommunications System) technical standard established by The 3GPP (The 3rd general partnership Project), and LTE-a (Long Term Evolution-Advanced) is a further enhancement of The LTE System. In an LTE or LTE-a system, random access plays a very important role, and in the following five scenarios, a random access process is required: 1) initial access; 2) connection reestablishment after radio link failure; 3) switching; 4) in the connection state, when the uplink is out of step, the downlink data needs to be sent; 5) in the connected state, when the uplink is out of step, there is uplink data to be sent. The Random Access is divided into a contention-based Random Access procedure and a non-contention Random Access procedure according to whether an eNB (eNode B, evolved node B) assigns a dedicated Random Access Preamble to a Random Access procedure initiated by a UE (user equipment), wherein the contention-based Random Access procedure is applicable to the above five scenarios.
In the contention-based random access process, when a plurality of UEs select the same random access preamble and simultaneously send the random access preamble to the eNB, since the eNB cannot distinguish which UE sends the random access preamble to the eNB, a corresponding random access time-frequency resource is allocated for the UE to send a random access MSG3 (Message 3, also referred to as Message 3) Message, and only when the eNB receives the MSG3 Message sent by the UE on the time-frequency resource, the collision is detected, so that the random access of the UE is rejected, thereby causing the random access delay of the UE to be higher.
In order to reduce the contention based random access delay, the patent application CN200910093893.8 proposes an improved method. The core idea of the method is as follows: when the eNB identifies that a plurality of UEs select the same random access lead code, the eNB does not return a random access response message to the UEs, and when the UEs do not detect the random access response message in the random access response window, the random access lead code is reselected and a random access process is initiated.
Although the prior art can reduce the time delay of the random access of the UE in the contention-based random access process, the longest random access response window is 10 subframes, and the UE needs to detect each subframe in the random access response window to determine that the eNB does not return the corresponding random access response, which not only increases the power consumption of the UE, but also has larger random access time delay.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for competing random access with lower time delay.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
One aspect of the present invention provides a random access method, including: sending a randomly selected random access preamble; receiving a random access response message, if a conflict indication domain in the random access response message indicates that a conflict occurs, ending the random access process, and retransmitting the random access lead code selected at random again; or, if the conflict indication field in the random access response message indicates that a conflict occurs, the priority of the random access is judged, if the priority is high, the random access message3 message is sent, the random access process is continued, otherwise, the random access process is ended, and the random access lead code selected randomly again is sent again.
Another aspect of the present invention provides another random access method, including: receiving a random access preamble; and when detecting that more than one same random access preamble codes are received in the same subframe, sending a random access response message, and setting a collision indication field in the random access response message as the occurrence of collision.
Yet another aspect of the present invention provides a user equipment, including: a transmitting unit and a receiving processing unit; the receiving and processing unit is used for receiving the random access response message, detecting whether a conflict indication domain in the random access response message has a conflict or not, and sending a command whether the conflict occurs or not; the sending unit is used for randomly selecting and sending the random access lead code, and starting or closing sending the random access message3 message according to the instruction whether the conflict occurs and sent by the receiving and processing unit.
Yet another aspect of the present invention provides a base station, including: a receiving detection unit and a sending unit; the receiving and detecting unit is used for receiving the random access lead codes and detecting whether more than one same random access lead codes are received on the same subframe, if so, sending a command of collision to the sending unit; the sending unit is used for sending the random access response message, and if the receiving detection unit sends the instruction of occurrence of conflict, the conflict indication domain in the random access response message is set to be the occurrence of conflict.
The invention sets 'conflict indication domain' in the random access response message, so that the UE can recognize the conflict in advance and initiate the next random access process as soon as possible, thereby reducing the random access time delay and saving the power expense of the UE. In addition, by introducing judgment of the random access priority level, when the UE with higher random access priority level has conflict, the random access process can be successfully completed, and multiple initiation of the random access process is avoided, so that the random access time delay of the UE with higher random access priority level is further reduced, and the Quality of Service (QoS) perception of the user is improved.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a flowchart of a random access method according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a MAC RAR.
Fig. 3 is a schematic structural diagram of a user equipment 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 invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. In the drawings, the thickness of regions and layers are exaggerated for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
Fig. 1 is a random access method according to an embodiment of the present invention. As shown in fig. 1, the method includes:
step S101: the UE randomly selects a random access preamble from a pre-stored random access preamble group and sends the random access preamble to the eNB;
in the standard 3GPP TS36.211, section 5.7.2, it is specified that the number of random access preambles that can be used per cell is at most 64. Section 5.1 of the standard 3GPP TS36.321 specifies that the random access preamble index that can be used for contention based random access is broadcast via a cell broadcast message, which includes the sizes of the random access preamble group a and the random access preamble group B. The UE randomly selects a random access preamble code from the random access preamble code group A or the random access preamble code group B, and sends the random access preamble code in a corresponding random access channel according to the initial transmission power defined by the standard.
Step S102: the eNB receives the Random Access preamble, if the eNB identifies that a plurality of UEs select the same Random Access preamble to transmit on the same subframe, the eNB returns a Random Access Response (RAR) and indicates that the Random Access Response indicates a collision;
in this step, when a plurality of UEs select the same random access preamble, because the UEs are different from the eNB in distance, even though the UEs select to transmit the preamble in the same subframe, the time for the preamble to reach the eNB side is different, and the eNB can recognize that the UEs transmit the same preamble in the same subframe, and the eNB may allocate the same random access time-frequency resource to the UEs, where the random access time-frequency resource information is carried in the random access response message; meanwhile, the eNB indicates the plurality of UEs that a collision occurs by setting a "collision indication field" in the random access response message to 1, or setting Yes (Yes), or setting True (True).
Section 6.1.5 of standard 3GPP TS36.321 specifies that the random Access response message is a MAC (Medium Access Control) PDU, which includes a MAC header (MAC header) and one or more MAC random Access responses (MAC RARs). Fig. 2 is a schematic structural diagram of a MAC RAR, which is composed of the following fields:
reserved bit (R), 1 bit;
a Timing Advance Command (11 bit) field;
uplink Grant domain (UL Grant), 20 bit;
a Temporary C-RNTI (Temporary Cell-Radio Network Temporary Identity) field, 16 bit;
section 6.2 of standard 3GPP TS36.213 specifies an uplink grant field with a length of 20 bits for indicating uplink transmission resources in a random access response, where the uplink grant field includes the following fields:
frequency Hopping indication (Hopping flag), 1 bit;
fixed length resource allocation (Fixed size resource block assignment), 10 bits;
truncated modulation and coding scheme (Truncated modulation and coding scheme), 4bit;
transmit power control signaling (TPC command for scheduled PUSCH) of a scheduled Physical Uplink Shared Channel (Physical Uplink Shared Channel), 3 bit;
an uplink transmission delay indication (UL delay), 1 bit;
channel quality indication request (CQI request), 1 bit;
in the contention-based random access procedure, the CQI request field is used to indicate whether to report a non-periodic CQI (Channel Quality Indicator), a PMI (Precoding Matrix Indicator), and an RI (Rank Indication), but in the contention-based random access procedure, the CQI request field is reserved.
Specifically, the method for setting the "collision indication field" in the random access response message includes:
using a reserved bit 'R' in the MAC RAR as a 'collision indication domain', if a collision occurs, setting the reserved bit 'R' to be 1, or setting Yes, or setting True; otherwise, 0 is set, or No (No), or False (False).
Or, taking the CQI request field in the UL Grant field as a "collision indication field", and if a collision occurs, setting the CQI request field to 1, or setting Yes, or setting True; otherwise, 0 is set, or No, or False.
Or, adding special collision indication domain in the MAC header or MAC RAR, if collision occurs, setting to 1, or setting Yes, or setting True; otherwise, 0 is set, or No, or False.
For convenience of description, the following description will be made by taking "conflict indication field" as 1 when a conflict occurs.
The conflict indication domain is set in the random access response message, so that the UE can recognize the occurrence of the conflict in advance and initiate the next random access process as soon as possible, thereby reducing the random access time delay and saving the power expense of the UE.
Step S103: UE receives the random access response message, if the 'conflict indication field' in the random access response indicates that a conflict occurs, the random access process is ended, and a random access lead code is reselected to initiate the random access process; otherwise, using the time-frequency resource in the random access response message, sending the MSG3 message.
Preferably, the UE detects whether a collision occurs by detecting whether the "collision indication field" is set to "1" or not: if the 'conflict indication field' is set to 1, a conflict occurs; otherwise, there is no conflict.
By receiving the indication in the 'conflict indication domain', the UE can recognize the occurrence of the conflict in advance and initiate the next random access process as soon as possible, thereby reducing the random access time delay and saving the power expense of the UE.
In an embodiment of the present invention, after receiving a random access response message with a "collision indication domain" set to 1, the UE determines a priority level of the current random access, and if the priority level is high, the UE sends an MSG3 message; otherwise, ending the random access flow, reselecting the random access lead code and initiating the random access process.
The method for judging the priority level of the random access by the UE comprises the following steps: and judging the priority level of random access according to the random access scene or the service QoS requirement. For example, in the five random access scenarios, the priority level of random access in the handover scenario is the highest. In addition, for the random access process initiated for transmitting data of different service types, different priority levels can be set according to the real-time requirement of the service. For example, if the real-time requirement of the traffic is high, the priority is also set to high priority.
Further, if the UE does not have the judgment capability of the random access priority level, it may always be handled as "priority level high" or as "priority level low".
By introducing judgment of the random access priority level, the UE with higher random access priority level can also successfully complete the random access process when the UE with higher random access priority level conflicts, and the random access process is prevented from being initiated for many times, so that the random access time delay of the UE with higher random access priority level is further reduced, and the QoS perception of the user is improved.
Fig. 3 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. As shown in fig. 3, the user equipment includes: a transmitting unit 301, a receiving processing unit 302 and a priority decision unit 303.
The receiving processing unit 302 is configured to receive the random access response message, detect whether a "collision indication field" in the random access response message indicates that a collision occurs, and send an instruction whether a collision occurs. Specifically, if the "collision indication field" in the random access response message is set to 1, a collision is detected; otherwise, no collision occurs.
The sending unit 301 is configured to randomly select a random access preamble from a pre-stored random access preamble group and send the random access preamble, and receive a command of whether a collision occurs, which is sent by the receiving unit 302, and if the command of collision occurrence is received, the MSG3 message is not sent, the random access process is ended, and the random access preamble is selected again and sent; otherwise, the MSG3 message is sent.
By receiving the indication in the 'conflict indication domain', the UE can recognize the occurrence of the conflict in advance and initiate the next random access process as soon as possible, thereby reducing the random access time delay and saving the power expense of the UE.
The priority decision unit 303 is configured to receive an instruction whether a collision occurs sent by the receiving unit 302, determine a priority level of the current random access according to a random access scenario or a service QoS requirement if the collision occurs, and send the priority level to the sending unit 301. Specifically, the priority decision method is as follows: for example, in the five random access scenarios, the priority level of random access in the handover scenario is the highest. In addition, for the random access process initiated for transmitting data of different service types, different priority levels can be set according to the real-time requirement of the service. For example, if the real-time requirement of the traffic is high, the priority is also set to high priority. Further, if the user equipment does not have the judgment capability of the random access priority level, it may be always handled as "priority level is high" or always handled as "priority level is low".
In another embodiment of the present invention, the sending unit 301 is further configured to receive the priority sent by the priority decision unit 303, and send an MSG3 message if receiving the instruction sent by the receiving processing unit 302 that a conflict occurs and the received priority is high; otherwise, the MSG3 message is not sent, the random access process is ended, and the random access lead code is selected to be sent again at random.
By introducing judgment of the random access priority level, the UE with higher random access priority level can also successfully complete the random access process when the UE with higher random access priority level conflicts, and the random access process is prevented from being initiated for many times, so that the random access time delay of the UE with higher random access priority level is further reduced, and the QoS perception of the user is improved.
Fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in fig. 4, the base station includes: reception detecting section 401 and transmitting section 402.
The receiving detection unit 401 is configured to receive a random access preamble, detect whether multiple identical random access preambles are received in the same subframe, and send a collision instruction to the sending unit 402 if multiple identical random access preambles are received in the same subframe.
The sending unit 402 is configured to generate and send a random access response message, and set the "collision indication field" in the random access response message to 1 if receiving the instruction of collision occurrence sent by the reception detecting unit 401.
The conflict indication domain is set in the random access response message, so that the UE can recognize the occurrence of the conflict in advance and initiate the next random access process as soon as possible, thereby reducing the random access time delay and saving the power expense of the UE.
It should be noted that names of messages, fields, or fields appearing in the embodiments of the present invention are only for convenience of describing the specific embodiments of the present invention, and are not used to limit the present invention.
The random access method provided by the invention solves the defects in the prior art, and mainly has the following beneficial effects:
(1) the conflict indication domain is set in the random access response message, so that the UE can recognize the occurrence of the conflict in advance and initiate the next random access process as soon as possible, thereby reducing the random access time delay and saving the power expense of the UE.
(2) By introducing judgment of the random access priority level, the UE with higher random access priority level can also successfully complete the random access process when the UE with higher random access priority level conflicts, and the random access process is prevented from being initiated for many times, so that the random access time delay of the UE with higher random access priority level is further reduced, and the QoS perception of the user is improved.
Exemplary embodiments of the present invention are specifically illustrated and described above. It is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.
Claims (14)
1. A random access method, comprising:
sending a randomly selected random access preamble; and
receiving a random access response message, if a conflict indication field in the random access response message indicates that a conflict occurs, ending the random access process, and retransmitting the random access lead code selected at random again; or, if the conflict indication field in the random access response message indicates that a conflict occurs, the priority of the random access is judged, if the priority is high, a random access message3 message is sent, the random access process is continued, otherwise, the random access process is ended, and the random access lead code selected again randomly is sent again.
2. The random access method according to claim 1, wherein the collision domain indication domain is: reserved bits in the medium access control-random access response, or a channel quality indication request field in an uplink authorization field, or a new bit added in a medium access control header or the medium access control-random access response.
3. The random access method of claim 2, wherein the indication of the occurrence of a collision by a collision indication field in the random access response message comprises: the conflict indication field is 1, or yes, or true.
4. The random access method according to any of claims 1-3, wherein the determining the priority of the current random access comprises: and judging the priority of random access according to the service quality requirement of a random access scene or service.
5. A random access method, comprising:
receiving a random access preamble; and
when detecting that more than one same random access preamble codes are received in the same subframe, sending a random access response message, and setting a collision indication field in the random access response message as collision.
6. The random access method according to claim 5, wherein the collision indication field is: reserved bits in the medium access control-random access response, or a channel quality indication request field in an uplink authorization field, or a new bit added in a medium access control header or the medium access control-random access response.
7. A user device, comprising: a transmitting unit and a receiving processing unit; wherein,
the receiving and processing unit is used for receiving a random access response message, detecting whether a conflict indication domain in the random access response message has a conflict or not, and sending a command whether the conflict occurs or not;
the sending unit is used for randomly selecting and sending the random access lead code, and starting or stopping sending the random access message3 message according to the instruction whether the conflict occurs and sent by the receiving and processing unit.
8. The UE of claim 7, wherein the turning on or off the random access message3 transmission according to the instruction of whether the collision occurs sent by the receiving and processing unit comprises: if the receiving processing unit sends a command of occurrence of conflict, the random access message3 message is not sent, the random access process is ended, and the sending unit randomly selects a random access lead code again to send; otherwise, sending the random access message3 message.
9. The user equipment of claim 7, wherein the user equipment further comprises: and the priority judging unit is used for receiving the instruction whether the conflict appears or not, which is sent by the receiving and processing unit, judging the priority of the random access if the instruction which the conflict appears is sent by the receiving and processing unit, and indicating the priority to the sending unit.
10. The user equipment of claim 9, wherein the priority decision unit decides the random access priority comprising: and judging the priority of random access according to the service quality requirement of a random access scene or service.
11. The ue according to claim 9 or 10, wherein the turning on or off the transmission of the random access message3 message according to the instruction of whether the collision occurs sent by the receiving processing unit comprises: if the receiving processing unit sends a command that collision occurs and the priority is high, sending the random access message3 message; otherwise, the random access message3 is not sent, the random access process is ended, and the sending unit randomly selects the random access lead code again for sending.
12. A base station, comprising: a receiving detection unit and a sending unit; wherein,
the receiving detection unit is used for receiving the random access lead codes and detecting whether more than one same random access lead codes are received on the same subframe, if so, sending a command of collision to the sending unit;
the sending unit is used for sending a random access response message, and if the receiving detection unit sends a conflict instruction, setting a conflict indication domain in the random access response message as conflict.
13. The base station of claim 12, wherein the collision indication field is: reserved bits in the medium access control-random access response, or a channel quality indication request field in an uplink authorization field, or a new bit added in a medium access control header or the medium access control-random access response.
14. A random access system comprising a user equipment and a base station, wherein the user equipment is a user equipment according to any one of claims 7-11, and the base station is a base station according to claim 12 or 13.
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