WO2012151953A1

WO2012151953A1 - Method, device, and user apparatus for triggering bsr

Info

Publication number: WO2012151953A1
Application number: PCT/CN2011/082900
Authority: WO
Inventors: 王博
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-07-21
Filing date: 2011-11-24
Publication date: 2012-11-15
Also published as: CN102355336B; CN102355336A

Abstract

Disclosed is a method for triggering a buffer status report (BSR). The method comprises: a user apparatus sending to a base station a transport block (TB) carrying a BSR; according to hybrid automatic repeat request (HARQ) feedback information returned by the base station and indicating whether the TB is successfully received, determining whether a HARQ failure occurs to the sent TB; when it is determined that the HARQ failure occurs to the sent TB, triggering a conventional BSR. Also disclosed are a device and a user apparatus for triggering a BSR. By using the method, device and user apparatus of the present invention, when a TB sent by a user apparatus and comprising a BSR fails to be received by a base station correctly, a user can be informed in advance that the sent BSR is not correctly received by the base station, so as to trigger a new conventional BSR in a timely and rapid fashion, thereby shortening an undesirable waiting time, preventing the phenomenon of frequent interruption in uplink transmission of the user apparatus, and greatly improving the efficiency of the uplink transmission of the user apparatus.

Description

BSR triggering method, device and user equipment

The present invention relates to the field of wireless communication technologies, and in particular, to a Buffer Status Report (BSR) triggering method, device, and user equipment. Background technique

In a Long Term Evolution (LTE) wireless network, a user equipment (UE, User Equipment) notifies a serving base station by carrying a BSR control element in a Media Access Control Transport Block (MAC TB). (eNodeB) The size of the upstream data buffered in the current UE logical channel group. After receiving the BSR of the UE, the eNodeB allocates the uplink resource to the UE according to the corresponding scheduling algorithm, and carries the uplink grant to notify the uplink resource corresponding to the UE in the downlink control signaling (DCI, Downlink Control Information), so that the UE performs the uplink data. send. According to the 3GPP 36.321 MAC layer protocol, the current BSR types of the UE are three types: a regular BSR, a filled BSR, and a periodic BSR.

According to the description of the 3GPP 36.321 MAC layer protocol, the current conventional BSR is triggered by the following conditions:

1) A logical channel belonging to a logical channel group, if there is uplink data available for transmission in a Radio Link Control (RLC) entity or a Packet Data Convergence Protocol (PDCP) entity, and the current logic Trigger a regular BSR when all logical channels in the channel group have no data to transmit;

2) a logical channel belonging to a logical channel group, if there is uplink data available for transmission in the RLC entity or the PDCP entity, and the priority of the logical channel is higher than that of the logical channel in which there is any pending data in any logical channel group Trigger the regular BSR when priority is given;

3) The retransmission BSR timer (retxBSR-Timer) times out, and the UE is in a logical channel group. A regular BSR is triggered when any of the logical channels has data to transmit.

According to the 3GPP 36.321 MAC layer protocol, if a regular BSR has been triggered to be sent, but there is no uplink grant, the UE triggers a scheduling request (SR, Scheduling Request) to request the serving eNodeB to configure an uplink grant for sending a regular BSR.

If the periodic BSR timer ( periodicBSR-Timer) of the UE times out, the BSR triggered at this time is called a periodic BSR.

If the UE allocates uplink resources, and the number of padding bits is greater than or equal to the sum of the number of bits of the BSR MAC control unit and its MAC subheader, such a BSR is called a padding BSR.

If a padding BSR is triggered, or a periodic BSR is to be sent, but there is no uplink grant at this time, the corresponding padding BSR or periodic BSR is not sent, and the SR is not triggered to request the uplink grant.

According to the 3GPP 36.321 MAC layer protocol, each time a UE sends a BSR, it needs to start or restart the retxBSR-Timer timer. In addition, once the UE receives the uplink grant for transmitting new data on the uplink shared channel (UL-SCH, Uplink Shared Channel), the retxBSR-Timer is restarted. According to the 3GPP 36.331 RRC protocol, the minimum value of the MAC layer retxBSR-Timer is 320 ms.

According to the above protocol, there is no way for the UE to send any BSR when there is no uplink authorization. However, the regular BSR may trigger the UE to send an SR first, requesting the serving eNodeB to configure an uplink grant for it, and the padding BSR and the periodic BSR do not have the privilege. In this way, after the UE sends any BSR, if the corresponding uplink grant is not obtained, the SR will be triggered to obtain the uplink grant after the condition of triggering the regular BSR is generated. In order to prevent the UE from frequently requesting uplink grants to the eNodeB, the protocol specifies strict conditions for triggering the regular BSR (see the three conditions triggered by the conventional BSR above). If no higher priority data is generated, it must be After the retxBSR-Timer expires, the regular BSR can be re-triggered to trigger the SR to obtain the uplink grant of the eNodeB. The retxBSR-Timer is equivalent to a time buffer window for the base station to allocate the uplink grant. During this time period, the UE is prevented from repeatedly requesting the uplink to the eNodeB. Authorization. In general, the UE sends any type of BSR. After receiving the eNodeB, the eNodeB allocates uplink resources to the UE through the uplink grant. However, if the eNodeB is busy, or there is no uplink resource to the UE in a short time, the UE will wait for the retxBSR-Timer to time out and then trigger a regular BSR to request the uplink grant. In this case, the protocol triggers the regular BSR. The mechanism is reasonable. However, if there is an uplink transmission block (TB, Transport Bulk) that is sent by the UE and is lost in the air interface transmission, or the TB fails to transmit the code stream due to the air interface, the base station cannot successfully receive the TB of the BSR. In this case, the eNodeB cannot allocate an uplink grant to the UE, and the UE continues to wait for the retxBSR-Timer length to use the newly triggered regular BSR to trigger the SR to obtain the uplink grant. During this period, the newly generated data on the original logical channel is generated. It is also impossible to trigger a BSR or an SR, causing a problem that the UE has a current interruption at the time of the retxBSR-Timer length. When the channel quality of the UE is not good, the uplink TB is lost, or the uplink TB has a code stream error in the air interface transmission, and the UE frequently fails to send packets in the retxBSR-Timer length to cause the uplink frequent interruption. The problem. Summary of the invention

The embodiment of the present invention provides a BSR triggering method, a device, and a user equipment, which are used to solve the problem that the base station cannot allocate uplink rights to the UE in time when the transport block carrying the BSR transmitted by the user equipment cannot be correctly received by the base station.

A BSR triggering method includes:

The UE sends the TB carrying the BSR to the base station;

Determining whether the transmitted ΤΒ has a HARQ failure according to whether the base station returns the feedback information of the Hybrid Automatic Repeat Request ( HARQ) successfully received by the eNB;

When it is determined that the transmitted TB fails to generate HARQ, a regular BSR is triggered.

A BSR triggering device includes: a sending module, a determining module, and a triggering module; wherein a sending module, configured to send, to the base station, a TB that carries the BSR;

a determining module, configured to determine, according to whether the base station returns the HARQ feedback information of the TB, whether the sent TB fails to be HARQ;

The triggering module is configured to trigger a regular BSR when the determining module determines that the transmitted transport block fails to generate HARQ.

A UE includes the above BSR triggering device.

The beneficial effects of the present invention are as follows:

The BSR triggering method, device, and UE provided by the embodiment of the present invention, after the UE sends the TB carrying the BSR to the base station, if the HARQ feedback information of the TB is successfully received according to whether the TB is successfully returned by the base station, it is determined that the TB of the sent TB fails to be HARQ. A regular BSR. The method adds a trigger condition for a conventional BSR. When an uplink TB that includes a BSR sent by the UE is lost in the air interface transmission, or the TB fails to transmit the code stream due to an air interface, the base station cannot successfully receive the BSR. In the case of TB, the UE can learn that the transmitted BSR is not correctly received by the base station, trigger a new regular BSR in a timely manner, shorten unnecessary waiting time, and avoid frequent interruption of uplink transmission of the UE, which greatly improves the performance. UE uplink transmission efficiency. DRAWINGS

The drawings are intended to provide a further understanding of the present invention, and are intended to be a part of the invention, and the description of the invention is not intended to limit the invention. In the drawing:

1 is a flow chart of a BSR triggering method in the prior art;

2 is a schematic structural diagram of a BSR triggering device according to an embodiment of the present invention;

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, It is to be understood that the present invention will be further described in detail below with reference to the drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The method for triggering the BSR triggering in the UE can be used by the UE in the prior art. Some processing mechanisms know in advance that the eNodeB does not correctly receive the BSR. In this way, the retxBSR-Timer can be terminated early, the uplink interrupt time is shortened, and the uplink transmission efficiency is improved.

Generally, the TB transmitted by the UE in the uplink, the eNodeB will feed back to the UE whether the TB is successfully received, and specifically, through the HARQ mechanism specified in the 3GPP 36.321 MAC layer protocol. Each time the UE sends an uplink TB, the demodulation success of the eNodeB will give the UE corresponding HARQ feedback. If the eNodeB demodulates successfully, the UE will be fed back a HARQ acknowledgment (ACK), and the UE may release the corresponding TB. If the eNodeB fails to demodulate, it will reply to the UE with a failure response (NACK) feedback requesting the UE to retransmit. If the number of retransmissions of the same TB by the UE is equal to the configured maximum number of HARQ retransmissions, the eNodeB still fails to correctly receive the TB, and then it is considered to appear. A HARQ failure (FAIL) occurs, thereby discarding the corresponding TB. At this time, the TB uplink transmission is considered to have failed. Based on the HARQ mechanism specified in the protocol, the UE can use the HARQ feedback of the eNodeB to confirm whether the BSR carried by the TB is correctly received by the eNodeB for each uplink TB carrying the BSR. If a TB that contains a BSR has a HARQ FAIL, it considers that the BSR uplink transmission fails and is not correctly received by the eNodeB. Otherwise, the eNodeB considers that the eNodeB correctly receives the BSR.

The TB receiving and confirming mechanism based on the HARQ mechanism, the present invention changes the trigger mechanism of the conventional BSR in the original protocol, and provides a BSR triggering method. The process is as shown in FIG. 1 and includes the following steps: Step S11: The UE sends a BSR to the base station. TB.

Here, it is assumed that the maximum number of HARQ retransmissions configured by the UE is MaxHarqRetranNum. Each time the UE sends a new BSR, the HARQ feedback of the TB containing the BSR begins to be unified. Count, set a counter (BsrHarqNakNum), initialized to 0.

Step S12: Determine whether the transmitted TB fails to generate HARQ according to whether the base station returns the HARQ feedback information of the TB successfully.

When it is determined to be YES, step S13 is performed; otherwise, step S14 is performed.

The determining, by the UE, whether the TB of the TB is faulty, includes: monitoring, by the UE, the HARQ feedback information of the TB returned by the receiving base station; when the received HARQ feedback information is a NACK, and the number of times the NACK is received is greater than or equal to the setting When the maximum number of HARQ retransmissions is determined, it is determined that the transmitted TB has a HARQ failure.

When the UE sends the TB carrying the BSR to the base station, the counter is started; when the received HARQ feedback information is ACK, the counter is re-initialized; when the HARQ feedback information is received as NACK, the counter is incremented by 1, and the counter is added. The count value after the addition of 1 is compared with the set number of HARQ maximum retransmissions. When the count value after the counter is incremented by 1 is greater than or equal to the set number of HARQ maximum retransmissions, it is determined that the transmitted transport block has a HARQ failure.

For the set BsrHarqNakNum, the HARQ feedback information of the TB sent by the base station to the UE is ACK, then the BsrHarqNakNum is re-initialized to 0, and the HARQ feedback statistics for the TB are stopped. If the HARQ feedback information of the TB transmitted by the base station to the UE is NACK, then BsrHarqNakNum=BsrHarqNakNum+l is executed. Then, if BsrHarqNakNum>=MaxHarqRetranNum is judged, step S13 is executed to trigger a regular BSR. Otherwise, continue to count the HARQ feedback information after the TB retransmission, and re-update the BsrHarqNakNum count value according to ACK or NAK.

Step S13: Trigger a regular BSR.

When the NACK of the TB that is currently sent by the UE is more than the set number of HARQs, the TB of the TB is considered to have a HARQ failure. Therefore, a regular BSR is triggered to request the base station to perform uplink authorization.

Step S14: No operation is performed. That is to say, in the above method, a condition for triggering the regular BSR is added to the trigger condition of the original triggering of the regular BSR. When the TB of the BSR carrying the BSR currently appears to be HARQ FAIL, a regular BSR is triggered.

Preferably, the method further includes: after the UE sends the TB carrying the BSR to the base station, if the UE generates new data on the logical channel, triggering a regular BSR.

In order to prevent the UE from continuously transmitting duplicate BSRs, it may be determined that after the UE sends a new BSR, to the time when the UE confirms that the BSR has HARQ FAIL, if the UE generates new data on the logical channel, it triggers in advance. A regular BSR. The newly triggered regular BSR is a different BSR than before. In this way, it can be avoided that the UE frequently retransmits the uplink TB because the eNodeB always demodulates the failure of a certain TB of the UE.

Based on the foregoing BSR triggering method provided by the embodiment of the present invention, the embodiment of the present invention further provides a BSR triggering device, where the device may be configured in a UE, and the structure of the device is as shown in FIG. 2, and includes: a sending module 10, a determining module. 20 and a trigger module 30; wherein

The sending module 10 is configured to send, to the base station, a TB that carries the BSR;

The determining module 20 is configured to determine, according to whether the base station returns the HARQ feedback information of the TB sent by the sending module 10, whether the transmitted TB fails to generate HARQ.

The triggering module 30 is configured to trigger a regular BSR when the determining module 20 determines that a HARQ failure occurs.

Preferably, the determining module 20 is specifically configured to: monitor the HARQ feedback information of the transport block sent by the sending module 10 returned by the receiving base station; when the received HARQ feedback information is NACK, and the number of times the NACK is received exceeds the set When the HARQ maximum number of retransmissions, it is determined that the transmitted TB has a HARQ failure.

Preferably, the determining module 20 is configured to: when the sending module 10 sends a TB carrying the BSR to the base station, start the counter; when the receiving the HARQ feedback information is ACK, Initializing the counter; when receiving HARQ When the feedback information is NACK, the counter is incremented by 1, and the count value after the counter is incremented by 1 is compared with the set HARQ maximum retransmission count; when the counter is incremented by 1, the count value is greater than or equal to the set HARQ. When the maximum number of retransmissions is determined, it is determined that the transmitted transmission block has a HARQ failure.

Preferably, the triggering module 30 is further configured to: after the sending module 10 sends the TB carrying the BSR to the base station, if the UE generates new data on the logical channel, triggering a regular BSR.

The foregoing BSR triggering method and device use the existing HARQ mechanism to shorten the triggering time of the conventional BSR when the base station cannot correctly receive the TB carrying the BSR sent by the UE. In general, if the time period for obtaining HARQ feedback for each uplink TB is 8 ms, and the maximum number of HARQ retransmissions is 4 times, the UE does not correctly receive the uplink BSR sent by the TB at the base station side. The delay is 32 ms, which is much smaller than the time of the retxBSR-Timer. The duration of the retxBSR-Timer is up to d and can be configured to be 320 ms. In this way, by using the method and the device of the present invention, the UE can learn that the eNodeB does not correctly receive a BSR in advance for several tens of ms, thereby quickly re-triggering the new regular BSR, shortening unnecessary waiting time, and avoiding uplink transmission of the UE. The frequent interruption of the phenomenon greatly improves the transmission efficiency of the UE uplink.

The above description shows and describes a preferred embodiment of the present invention, but as described above, it should be understood that the present invention is not limited to the forms disclosed herein, and should not be construed as Other combinations, modifications, and environments are possible and can be modified by the teachings or related art or knowledge within the scope of the inventive concept described herein. All changes and modifications made by those skilled in the art are intended to be within the scope of the appended claims.

Claims

Claim

A buffer status report BSR triggering method, the method includes: the user equipment sends a transport block carrying a BSR to a base station;

Determining whether the transmitted transport block has a HARQ failure according to whether the base station successfully receives the hybrid automatic repeat request HARQ feedback information of the transport block;

A regular BSR is triggered when it is determined that the transmitted transport block has failed HARQ.

2. The method according to claim 1, wherein the determining whether the transmitted transport block has a HARQ failure comprises:

The user equipment monitors the HARQ feedback information of the transport block returned by the base station; when the received HARQ feedback information is a failure acknowledgement NACK, and the number of received NACKs exceeds the set number of HARQ maximum retransmissions, the determined transport block is determined. A HARQ failure has occurred.

The method according to claim 2, wherein, when the received HARQ feedback information is a failure response NACK, and the number of times the NACK is received is greater than or equal to the set maximum number of HARQ retransmissions, the determined transmission is determined. The HARQ failure of the transport block includes:

When the user equipment sends a transport block carrying the BSR to the base station, the counter is started;

When the HARQ feedback information is received as an acknowledgment ACK, the counter is re-initialized; when the HARQ feedback information is received as a NACK, the counter is incremented by 1, and the counter is incremented by 1 and the set HARQ is set. The maximum number of retransmissions is compared. When the counter value after the counter is incremented by one is greater than or equal to the set number of HARQ maximum retransmissions, it is determined that the transmitted transport block has a HARQ failure.

The method according to any one of claims 1 to 3, characterized in that the method further comprises:

After the user equipment sends the transport block carrying the BSR to the base station, if the user equipment generates new data on the logical channel, a regular BSR is triggered.

5. A BSR triggering device, the device comprising: a transmitting module, a determining module Block, and trigger module; wherein

a sending module, configured to send, to the base station, a transport block that carries the BSR;

a determining module, configured to determine, according to whether the base station returns the HARQ feedback information of the transport block, whether the transmitted transport block has a HARQ failure;

The device according to claim 5, wherein the determining module is specifically configured to:

The HARQ feedback information of the transport block returned by the receiving base station is monitored; when the received HARQ feedback information is NACK, and the number of received NACKs is greater than or equal to the set maximum number of HARQ retransmissions, it is determined that the transmitted transport block has a HARQ failure. .

The device according to claim 6, wherein the determining module is specifically configured to: when determining that the transmitted transport block fails to generate HARQ:

When the sending module sends a transport block carrying the BSR to the base station, the counter is started; when the HARQ feedback information is received as an ACK, the counter is re-initialized; when the HARQ feedback information is received as a NACK, the counter is incremented by one. And comparing the count value after the counter is incremented by one with the set number of HARQ maximum retransmissions; when the counter value after the counter is incremented by 1 is greater than or equal to the set number of HARQ maximum retransmissions, it is determined that the transmitted transport block appears HARQ failed.

The device according to any one of claims 5 to 7, wherein the triggering module is further configured to: after the sending module sends a transport block carrying a BSR to a base station, if the user equipment is on a logical channel Generating new data triggers a regular BSR.

A user equipment, comprising the BSR triggering device according to any one of claims 5 to 8.