WO2013013606A1

WO2013013606A1 - Random access procedure management method and user equipment in long term evolution network

Info

Publication number: WO2013013606A1
Application number: PCT/CN2012/079022
Authority: WO
Inventors: 东宁
Original assignee: 华为技术有限公司
Priority date: 2011-07-22
Filing date: 2012-07-23
Publication date: 2013-01-31
Also published as: CN102271417B; CN102271417A

Abstract

Disclosed are a random access procedure management method and user equipment in a long term evolution network. The method includes: user equipment triggering a random access procedure, and entering a random access preparation state; the user equipment judging whether the random access procedure should be ended, and if the judgement is yes, then ending the random access procedure; and if the judgement is no, then continuing to judge whether the random access procedure should be ended until the time when the user equipment is in the random access preparation state reaches a pre-determined time duration; and if the time when the user equipment is in the random access preparation state reaches a pre-determined time duration, the user equipment executing the random access procedure. Implementing the embodiments of the present invention can reduce the number of times the random access procedure is executed, and improve the access performance of the entire long term evolution network.

Description

Random access process management method and user equipment in long-term evolution network

Technical field

The present invention relates to the field of communications, and in particular, to a random access procedure management method and user equipment in a long term evolution network. Background technique

In the existing Long Term Evolution (LTE) system, all User Equipments (UEs) that are connected to the evolved NodeB (eNB) share air interface resources, that is, the eNB is at each transmission interval. Time Interval (TTI) dynamically allocates transmission resources to subordinate UEs according to information such as the amount of data of the UE. In the uplink data scheduling, the UE reports its buffer data amount to the eNB by sending a Buffer Status Report (BSR), thereby providing reference information for the uplink scheduling of the eNB. The BSR reporting mechanism adopted in the current LTE system is described in detail below:

When at least one BSR is triggered (and not cancelled), the Media Access Control (MAC) entity performs the following operations on each TTI:

If the current TTI has uplink transmission resources, then

Construct a BSR MAC CE (BSR MAC Control Unit), ready to send;

Start or restart the cycle BSR timer;

Start or restart the retransmission BSR timer.

Otherwise, if a regular BSR is triggered, Bay' J

If there is no semi-static uplink authorization, or the triggered BSR is not triggered by the Scheduling Request (SR) mask (SR-Masking) logical channel, the data can be triggered.

Trigger SR.

When at least one SR is triggered, the MAC entity performs the following operations in each TTI: If there is no uplink transmission resource currently,

If the upper layer does not configure the SR resource (the SR resource is invalid), the random access procedure is triggered; otherwise, if the SR inhibit timer (sr-ProhibitTimer) is not running,

If the SR counter (SR_COUNTER) is less than the maximum number of SR transfers (dsr-TransMax) SR counter plus 1;

Send the SR on the configured SR resource;

Start the SR disable timer.

Otherwise,

Notifying the RRC to release related configuration resources;

All triggered SRs are cancelled and a random access procedure is initiated.

A specific random access procedure includes: random access procedure initialization, random access resource selection, random access sequence transmission, random access response message reception, contention resolution message processing, and random access procedure: 3⁄4.

FIG. 1 is a schematic diagram showing an existing processing flow of an SR trigger and a subsequent random access procedure in an existing FDD-LTE mode (the same processing as TDD-LTE exists in FDD-LTE). As shown in Figure 1, when the random access procedure is triggered, the random access process is triggered immediately. At this time, the UE enters the random access procedure processing state. If the random access sequence is sent, the eNB sends a new uplink grant. The UE is used to send uplink data, but since the UE has entered the random access procedure processing state, the UE discards the uplink grant; this means that there is currently discarding the uplink grant that can be used to send the BSR, and triggering unnecessary Random access process.

In addition, FIG. 2 shows the existing FDD (Frequency Division Duplexing) LTE and two mode modes (TDD (Time Division Duplexing) LTE has the same processing as FDD LTE) A schematic diagram of another existing process flow of the SR trigger and subsequent random access processes. As shown in FIG. 2, when the random access triggers, the random access process is triggered, and the UE enters the random access procedure processing state. If the eNB sends an SR resource to the UE before the random access sequence is sent, The UE takes effect on the SR resource, but since the UE has entered the random access procedure processing state, the current implementation does not cancel the random access procedure; this means that the current processing of the existing SR resource is also triggered to apply for the uplink grant resource. Random access process. Summary of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a random access process management method and user equipment in a long term evolution network. It can reduce the number of executions of the random access process and improve the access performance of the entire long-term evolution network.

In order to solve the above technical problem, a random connection in a long-term evolution network provided by an embodiment of the present invention is provided. Into the process management method, including:

The user equipment triggers a random access procedure and enters a random access preparation state.

Determining, by the user equipment, whether the random access procedure should be terminated, and if the determination is yes, terminating the random access procedure; if the determination is no, proceeding to determine whether the random access procedure should be terminated until the user equipment The time in the random access preparation state reaches a predetermined length of time;

When the time when the user equipment is in the random access preparation state reaches a predetermined time length, the user equipment performs a random access procedure.

Correspondingly, the user equipment provided by the embodiment of the present invention includes:

a random access triggering module, configured to trigger a random access procedure, and enter a random access preparation state; a processing module, configured to determine whether the random access procedure should be terminated, and if the determination is yes, terminate the random access procedure; If the determination is no, proceed to determine whether the random access procedure should be terminated, until the time when the user equipment is in the random access preparation state reaches a predetermined time length; when the user equipment is in the random access preparation When the time of the state reaches a predetermined length of time, a random access procedure is performed.

The implementation of the embodiments of the invention has the following beneficial effects:

In the embodiment of the present invention, when the random access procedure is triggered, the random access process is put into a preparation state, and then, in the random access preparation state, whether the random access procedure should be terminated according to the received condition, when it is determined to be When the random access procedure is terminated, the number of executions of the random access procedure can be reduced, and the access performance of the entire long-term evolution network is greatly improved. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative labor.

1 is a schematic flowchart of an embodiment of an SR triggering and subsequent random access procedure in an existing FDD-LTE mode;

2 is a schematic diagram of another embodiment process flow of an SR trigger and a subsequent random access procedure in the existing FDD-LTE mode;

3 is an implementation of an SR trigger and a subsequent random access procedure in the FDD-LTE mode of the present invention. Example process flow diagram;

4 is a schematic flowchart of another embodiment of an SR triggering and subsequent random access procedure in the FDD-LTE mode of the present invention;

FIG. 5 is a schematic structural diagram of an embodiment of a user equipment according to the present invention; FIG.

6 is a schematic structural diagram of an embodiment of the processing module of FIG. 5;

7 is a schematic structural diagram of another embodiment of the processing module of FIG. 5;

Figure 8 is a block diagram showing the structure of another embodiment of the processing module of Figure 5. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

As mentioned above, in the prior art, when the random access procedure is triggered, it will not be terminated due to the triggering of other processes, which will cause the system to continuously process unnecessary random access procedures. In this regard, the embodiment of the present invention provides a method for managing a random access procedure in a long term evolution network, including: the user equipment triggers a random access procedure, and enters a random access preparation state; the user equipment determines whether the random access procedure should be terminated. In the access process, if the determination is yes, the random access procedure is terminated; if the determination is no, the determination of whether the random access procedure should be terminated is continued until the user equipment is in the random access preparation state. The time reaches a predetermined length of time; when the time when the user equipment is in the random access preparation state reaches a predetermined time length, the user equipment performs a random access procedure.

Therefore, in the embodiment of the present invention, when the random access procedure is triggered, the random access procedure is entered into a random access preparation state, and then, in the random access preparation state, whether the random connection should be terminated according to the received condition may be determined. In the process of entering, when the determination is yes, the random access procedure is terminated, so that the number of executions of the random access procedure is reduced, and the access performance of the entire long-term evolution network is greatly improved. In a specific implementation, the method of the present invention is applicable to FDD LTE and TDD LTE. The following embodiments are described by taking FDD LTE as an example.

3 is a schematic flow chart showing an embodiment of an SR triggering and subsequent random access procedure of the present invention. As shown in FIG. 3, the processing flow of this embodiment includes:

Step S310, configuring a physical random access channel (Prach) effective position in the subframe number 3 of each radio frame. This step is used to complete the configuration of all parameters of the random access procedure. Step S311, the regular BSR is triggered, and the SR is also triggered (assuming that the frame number is n (n is a positive integer between 0 and 1023), and the subframe number is 4), so that the SR enters the scheduling preparation state (the SR The scheduling preparation state is a fixed period of time between the triggering of the SR and the sending of the SR. For example, the scheduling period in which the subframe number is 4 to the subframe number 10 is the scheduling preparation state of the SR, and when the scheduling preparation state reaches the predetermined length of time, The SR will be sent. In the specific implementation, the SR scheduling timer ( sr-ProhibitTimer ) can be set to set the scheduling state of the SR. For example, the SR prohibit timer is set to work from frame number 4 to subframe number 10. It indicates that the SR is in the scheduling preparation state in the period from the frame number 4 to the subframe number 10.

In step S312, it is determined whether the current transmission interval has an uplink transmission resource and whether the scheduling request resource is currently configured. If the determination is yes, step S313 is performed; if the determination is no, step S314 is performed; step S313, the scheduling preparation state of the SR is terminated, And send the SR, ending the method. In a specific implementation, the following process may be specifically performed in step S313: If the SR prohibit timer (sr-ProhibitTimer) is not running (equivalent to terminating the scheduling preparation state of the SR), if the SR counter (SR_COUNTER) is smaller than the maximum number of SR transmissions ( dsr-TransMax ) The SR counter is incremented by 1; the SR is sent on the configured SR resource.

Step S314: Trigger a random access procedure, and enter the random access procedure into a random access preparation state (assuming that the frame number is n and the subframe number is 4). (The random access preparation state of the random access procedure refers to a fixed time period between the triggering of the random access procedure and the execution of the random access procedure, for example, the time from the subframe number 4 to the subframe number 8 The random access procedure is performed when the random access preparation state reaches a predetermined time length. In a specific implementation, the random access preparation prohibition timer of the random access procedure may be set by setting a random access procedure prohibition timer. For example, if the forbidden timer of the random access procedure is set to work from frame number 4 to subframe number 8, the random access procedure is in the random access preparation state in the period from frame number 4 to subframe number 8.

In step S315, it is determined whether the uplink grant issued by the eNB is received. If the determination is yes, step S316 is performed; if the determination is no, step S315 is continued until the time of the random access preparation state of the random access procedure is reached. The length of the scheduled time. (Assume that when the frame number is n and the subframe number is 8, when the uplink grant issued by the eNB is received, step S316 is performed subsequently, and if the frame number is 4 to the subframe number is not received, the process is not received. To the upstream authorization, the result of the determination in step S315 will be no).

Step S316, terminating the random access procedure, and using the uplink authorization group MAC received in step S315 A PDU (Medium Access Control Protocol Data Unit) data packet, which is included in the MAC PDU and sent to the eNB. Or the cache data protection that the user equipment needs to send is sent to the eNB in the MAC PDU.

Step S317, when the time when the user equipment is in the random access preparation state reaches a predetermined time length (for example, to the subframe number 9), and the current transmission interval has no uplink transmission resources and there is a physical random access channel resource, Perform a random access procedure. The performing the random access procedure includes: a random access procedure initialization, a random access resource selection, a random access sequence transmission, a random access response message reception, a contention resolution message processing, and a random access procedure is completed.

In the foregoing embodiment, when the random access procedure is triggered, the subsequent process of the random access process is not performed immediately, but the random access preparation state is entered, and then, in the time period of the random access preparation state, it is determined whether the eNB is sent. If the determination is yes, the BSR or user equipment cache data is sent to the eNB according to the uplink grant, which reduces the number of discarding of the uplink grant, enables the uplink grant to be effectively executed, and reduces random access. The number of executions of the process greatly improves the access performance of the entire long-term evolution network.

4 is a schematic flow chart showing another embodiment of the SR triggering and subsequent random access procedure of the present invention. As shown in FIG. 4, the processing flow of this embodiment includes:

Step S410, configuring a physical random access channel (Prach) effective position in the subframe number 3 of each radio frame.

In step S411, the regular BSR is triggered, and the SR is also triggered (assuming the frame number is n and the subframe number is 4), so that the SR enters the scheduling preparation state.

In step S412, it is determined whether the current transmission interval has an uplink transmission resource and whether the scheduling request resource is currently configured. If the determination is yes, step S413 is performed; if the determination is no, step S414 is performed; step S413, the scheduling preparation state of the SR is terminated, And send the SR, ending the method.

Step S414: Trigger a random access procedure, and enter the random access procedure into a random access preparation state. No frame number is n, and subframe number is 4).

In the specific implementation, the steps S410-S414 of the embodiment are the same as those of the embodiment shown in FIG. 3, and details are not described herein.

Step S415, determining whether the SR parameter sent by the eNB is received (the SR parameter includes: a physical control uplink channel PUCCH resource index corresponding to the SR, an SR configuration index, and a maximum number of SR transmissions, etc.), If the determination is yes, step S416 is performed; then step S415 is continued until the time of the random access preparation state of the random access procedure reaches a predetermined length of time. (Assume that when the frame number is n and the subframe number is 8, the SR parameter sent by the eNB is received, then step S416 will be performed subsequently.

Step S416, terminating the random access procedure, and resetting that the SR is triggered, and causing the SR to enter a scheduling preparation state.

Step S417, when the time when the user equipment is in the random access preparation state reaches a predetermined time length (for example, to the subframe number 9), and the current transmission interval has no uplink transmission resources and there is a physical random access channel resource, Perform a random access procedure. In the specific implementation, step S417 is the same as step S317 in FIG. 3 and is not described here.

In the foregoing embodiment, when the random access procedure is triggered, the subsequent process of the random access process is not performed immediately, but the random access preparation state is entered, and then, in the time period of the random access preparation state, it is determined whether the eNB is sent. If the SR parameter is YES, the SR will be re-triggered instead of the random access procedure. Using the SR resource to apply for the uplink grant can save the system's physical random access channel resources and reduce the number of random access procedures. Access performance of the entire long-term evolution network. The mobile terminal, the data card, and the like), an embodiment of the user equipment of the present invention will be described below with reference to Figs.

Figure 5 is a block diagram showing the structure of an embodiment of the user equipment of the present invention. As shown in FIG. 5, the user equipment in this embodiment includes a scheduling request triggering module 51, a random access triggering module 52, and a processing module 53. among them:

The scheduling request triggering module 51 is configured to trigger a scheduling request and enter a scheduling preparation state. The scheduling preparation state of the SR is a fixed period of time between the triggering of the SR and the sending of the SR. For example, the scheduling period in which the subframe number is 4 to the subframe number 10 is the scheduling preparation state of the SR, and the scheduling preparation state is used. The SR will be sent when the predetermined length of time is reached.

The random access triggering module 52 is configured to trigger a random access procedure, and the random access procedure is entered into a random access preparation state. The random access preparation state of the random access procedure refers to triggering a random access procedure. A fixed period of time between the execution of the random access procedure, for example, a period from subframe number 4 to subframe number 8. When the random access preparation state reaches a predetermined length of time, random access is performed. In the specific implementation, the random access process prohibit timer can be set to set the random The random access preparation state of the access procedure, for example, setting the prohibition timer of the random access procedure to work in the frame number 4 to the subframe number 8 indicates that the frame number is 4 to the subframe number is 8 The access process is in the state of random access preparation. In a specific implementation, when the scheduling request triggering module 51 is configured to trigger the scheduling request, and the scheduling request is in the scheduling preparation state, the random access triggering module 52 learns that there is no uplink transmission resource and the current unconfigured scheduling request in the current transmission interval. When the resource is used, the random access procedure is triggered, and the random access procedure is put into random access preparation.

The processing module 53 is configured to determine whether the random access procedure should be terminated, and if the determination is yes, terminate the random access procedure; if the determination is no, continue to perform a judgment to determine whether the random access procedure should be terminated, until the The time of the random access preparation state of the random access procedure reaches a predetermined length of time; when the random access preparation state of the random access procedure reaches a predetermined time length, a random access procedure is performed. Specifically, the processing module 53 may determine, according to various conditions, whether the random access procedure should be terminated, for example, determining whether an uplink grant is received, and determining, for example, whether a scheduling request parameter is received. 6 through 8 show schematic diagrams of three embodiments of the processing module 53. specific:

FIG. 6 is a schematic structural diagram of an embodiment of a processing module of a user equipment according to the present invention. As shown in FIG. 6, the processing module 53 of this embodiment includes a first determining module 531, a first terminating module 532, a first uplink processing module 533, and a random access processing module 537, where:

The first determining module 531 is configured to determine whether an uplink grant is received, and generate a determination result that is determined to be yes or no. As described above, the first judging module 531 can determine whether the uplink grant is received in the random access preparation state of the random access procedure with the subframe number 4 to 8.

The first termination module 532 is configured to terminate the random access procedure when the determination result of the first determining module 531 is YES.

The first uplink processing module 533 is configured to send a buffer status report of the user equipment by using the uplink authorization group packet after the first termination module 532 terminates the random access process.

The random access processing module 537 is configured to perform, when the time of the random access preparation state of the random access process reaches a predetermined time length, and the current transmission interval has no uplink transmission resource and the physical random access channel resource exists, Random access process.

Figure 示意图 is a schematic structural diagram of another embodiment of a processing module of a user equipment of the present invention. As shown in FIG. 3, the processing module 53 of the present embodiment includes a first determining module 531, a first termination module 532, a second uplink processing module 534, and a random access processing module 537, where: the first determining module 531, The first termination module 532 and the random access processing module 537 are the same as the embodiment shown in FIG. 6, and are not described herein. The second uplink processing module 534 is configured to send the cached data of the user equipment by using the uplink authorization group packet after the first termination module 532 terminates the random access procedure.

FIG. 8 is a schematic structural diagram of another embodiment of a processing module of a user equipment according to the present invention. As shown in FIG. 8, the processing module 53 of this embodiment includes a second determining module 5311, a second termination module 5321, a third uplink processing module 5331, and a random access processing module 537, where: the random access processing module 537 The same as the embodiment shown in Fig. 6, and no mention is made here.

The second determining module 5311 is configured to determine whether a scheduling request parameter is received, and generate a determination result of determining whether the determination is yes or not. As described above, the first judging module 531 can determine whether the uplink grant is received in the random access preparation state of the random access procedure with the subframe number of 4 to 8.

The second termination module 5321 is configured to terminate the random access procedure when the determination result of the second determining module 5311 is YES.

The third uplink processing module 5331 is configured to: after the second termination module 5321 terminates the random access procedure, reset the scheduling request to be triggered and enter a scheduling preparation state.

The above are only the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and the equivalent changes made by the claims of the present invention are still within the scope of the present invention.

Claims

Claim

A method for managing a random access procedure in a long-term evolution network, the method comprising: the user equipment triggering a random access procedure, and entering a random access preparation state;

2. The method for managing a random access procedure in a long term evolution network according to claim 1, wherein the user equipment determines whether the random access procedure should be terminated, and if the determination is yes, the random access procedure is terminated. , including:

The user equipment determines whether the uplink authorization is received. If the determination is yes, the random access procedure is terminated, and the buffer status report of the user equipment is sent by using the uplink authorization group packet.

The method for managing a random access procedure in a long term evolution network according to claim 1, wherein the user equipment determines whether the random access procedure should be terminated, and if the determination is yes, the random access procedure is terminated. , including:

The user equipment determines whether the uplink authorization is received. If the determination is yes, the random access procedure is terminated, and the cached data of the user equipment is sent by using the uplink authorization group packet.

The user equipment determines whether a scheduling request parameter is received. If the determination is yes, the random access procedure is terminated, and the scheduling request is reset and the scheduling preparation state is entered.

The method for managing a random access procedure in a long term evolution network according to any one of claims 1 to 4, wherein when the time when the user equipment is in the random access preparation state reaches a predetermined length of time The user equipment performs a random access procedure, including:

When the time when the user equipment is in the random access preparation state reaches a predetermined time length, and the current transmission interval has no uplink transmission resources and there is a physical random access channel resource, the user setting The random access process is performed.

The method for managing a random access procedure in a long term evolution network according to any one of claims 1 to 5, wherein when the scheduling request is triggered and enters a scheduling preparation state, and the current transmission interval has no uplink transmission resource and When the scheduling request resource is not configured, the user equipment triggers the random access procedure and enters the random access preparation state.

7. A user equipment, comprising:

The user equipment according to claim 7, wherein the processing module comprises: a first determining module, configured to determine whether an uplink authorization is received, and generate a determination result that is determined to be yes or not;

a first termination module, configured to terminate the random access process when the determination result of the first determining module is YES;

a first uplink processing module, configured to send a buffer status report of the user equipment by using the uplink authorization group packet after the first termination module terminates the random access process;

The random access processing module is configured to perform a random access procedure when the time when the user equipment is in the random access preparation state reaches a predetermined length of time.

a second uplink processing module, configured to send, by using the uplink authorization group packet, cache data of the user equipment, after the first termination module terminates the random access process;

a random access processing module, configured to: when the user equipment is in the random access preparation state When the predetermined length of time is reached, a random access procedure is performed.

The user equipment according to claim 7, wherein the processing module comprises: a second determining module, configured to determine whether a scheduling request parameter is received, and generate a determination result that is determined to be yes or not;

a second termination module, configured to terminate the random access process when the determination result of the second determining module is YES;

a third uplink processing module, configured to: after the second termination module terminates the random access process, reset a scheduling request to be triggered and enter a scheduling preparation state;

a random access processing module, configured to perform random access when the time when the user equipment is in the random access preparation state reaches a predetermined time length, and the current transmission interval has no uplink transmission resources and physical random access channel resources exist Into the process.

The user equipment according to any one of claims 6 to 10, further comprising: a scheduling request triggering module, configured to trigger a scheduling request and enter a scheduling preparation state;

The random access triggering module is specifically configured to: when the scheduling request triggering module triggers the scheduling request, and set the scheduling request to enter a scheduling preparation state, and learn that the current transmission interval has no uplink transmission resource and the current unconfigured scheduling request resource When the random access procedure is triggered, the random access preparation state is entered.