WO2009024073A1

WO2009024073A1 - Method and system of multi-user feedback, method of downlink transmission, base station and user device

Info

Publication number: WO2009024073A1
Application number: PCT/CN2008/072023
Authority: WO
Inventors: Yinghui Yu; Xiaoan Fan; Junwei Wang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-08-17
Filing date: 2008-08-18
Publication date: 2009-02-26
Also published as: CN101369874A; CN101369874B

Abstract

A method of multi-user feedback includes that: when making the multicast service downlink transmission, receiving the position indication information which is needed to make the uplink feedback for the multicast service, and determining the uplink feedback channel according to the position indication information, making the uplink feedback for the received downlink packet of the multicast service. Additionally, a system of multi-user feedback, base station and UE are also provided. The scheme disclosed by the invention can implement the multi-user feedback in the multicast service.

Description

TECHNICAL FIELD The present invention relates to mobile communication technologies, and in particular, to a method for multi-user feedback in a multicast service, a downlink transmission method, a system, a base station, and a user equipment. (UE). BACKGROUND In order to effectively utilize mobile network resources, a Broadcast and Multicast Service (MBMS) is proposed, that is, a point-to-multipoint multicast service is realized, and a multicast service refers to a data source to multiple targets. Compared with the previous point-to-point Unicast service mode, the method of transmitting data packets can save bandwidth and realize network resource sharing.

For unicast services, each UE can perform uplink feedback according to the received downlink transmission. The content of the uplink feedback includes an acknowledgement (ACK/NACK) signal and a channel quality indicator (CQI), and the base station can determine whether to retransmit the data packet and adjust the modulation and coding format according to the uplink feedback. To improve system performance. The resource occupied by the uplink CQI is displayed by the base station by using downlink control signaling; and the ACK/NACK channel used by the uplink ACK/NACK signal can occupy two resource pools, and the ACK/NACK channels in each resource pool are respectively numbered in a certain order. , called the channel number. This channel number is used to distinguish different ACK/NACK channels. In actual applications, it may not be represented as a channel number. For example, it may be a coordinate value of time, frequency, and code three-dimensional space.

In the first resource pool, the channel location occupied by the ACK/NACK signal corresponding to the downlink data packet implicitly corresponds to the channel location occupied by the downlink control signaling for scheduling the data packet. For example, as an example of implicitly corresponding to the channel number occupied by the downlink control signaling, if the control signaling of a downlink data packet occupies the Mth downlink shared control channel, the uplink ACK/NACK of the downlink data packet is used. The signal feedback occupies the Nth ACK/NACK channel, where M has a certain relationship with N, the simplest being M=N. Therefore, the UE learns the resource location of the feedback ACK/NACK signal by reading the downlink control message. Taking the case of 4 UEs as an example, FIG. 1(a) shows a schematic structural diagram of a downlink shared control channel of a unicast service. As shown in FIG. 1(a), the downlink control signaling of the four UEs respectively occupy four control channels, that is, control channel 1 to control channel 4. The UE uses its own UE ID to decode the downlink control signaling in the control channel. When the UE can correctly decode, that is, the control signaling of the control channel is sent to the UE. As shown in FIG. 1(a), UE1, UE2, UE3, and UE4 can be decoded and sent by using their own UE ID. The control signal of the control signal, the control channel number of the control signaling may implicitly indicate that the UE sends the ACK/NACK signal by using the ACK/NACK channel in the first resource pool. Therefore, the UE may perform the control signaling according to the decoding. The control channel number where it is located, and the ACK/NACK signal is occupied by the ACK/NACK channel. FIG. 1(b) shows the structure of the uplink feedback channel of four UEs in the unicast service. In FIG. 1(b), each UE occupies an ACK/NACK channel with the same channel number as the control channel, that is, ACK/NACK channel 1 to ACK/NACK channel 4, and performs ACK/NACK signal feedback.

In the second resource pool, the channel location occupied by the ACK/NACK information corresponding to the data packet is explicitly notified by the signaling, and the downlink control signaling at this time can occupy the downlink shared control channel, and can also use other resources as the high layer control signaling. transmission.

In the prior art, since for a multicast service, corresponding to one data packet, each UE does not know that there are several UEs in total receiving multicast services at the same time, and does not know which channel to perform ACK/NACK signal on. Feedback, so uplink feedback in multicast services is not yet possible. SUMMARY OF THE INVENTION In view of this, an embodiment of the present invention provides a method for multi-user feedback in a multicast service, a downlink transmission method, a system, a base station, and a user equipment (UE), so as to implement in a multicast service. Multi-UE feedback.

The method for multi-user feedback provided in the embodiment of the present invention includes:

And performing location indication information required for performing uplink feedback on the multicast service, and determining an uplink feedback channel according to the location indication information, and downlink packets of the received multicast service. Perform upstream feedback.

The downlink transmission method provided in the embodiment of the present invention includes:

When the number of the UEs that receive the same multicast service is lower than the preset threshold, the downlink transmission that is required by the UE is performed on the multicast service, and the uplink feedback required for the multicast service is sent to the UE. Location indication information.

The system for multi-user feedback provided in the embodiment of the present invention includes:

The base station is configured to: perform downlink transmission that needs feedback from the UE, and send the location indication information required for feedback to the UE, when the number of the UEs that receive the same multicast service is lower than the preset threshold; The device UE is configured to determine, according to the location indication information, a channel resource for performing uplink feedback, and perform uplink feedback on the downlink packet of the received multicast service on the determined feedback channel.

The base station provided in the embodiment of the present invention includes:

a first downlink transmission module, configured to perform downlink transmission that requires UE feedback to the multicast service when the number of UEs that receive the same multicast service is lower than a preset threshold;

And an information sending module, configured to send, to the UE, location indication information required for feedback when the number of the UEs that receive the same multicast service is lower than a preset threshold. The UE provided in the embodiment of the present invention includes:

An information receiving module, configured to receive location indication information;

a feedback channel determining module, configured to determine, according to the location indication information received by the information receiving module, a channel resource that the UE performs uplink feedback;

And an uplink feedback module, configured to perform uplink feedback on the downlink data packet of the multicast service received by the UE on the feedback channel determined by the feedback channel determining module.

It can be seen that, in the embodiment of the present invention, when the number of UEs that receive the same multicast service is lower than the preset threshold, downlink transmission that needs UE feedback is performed on the multicast service, and is delivered to the UE. Retrieving the required location indication information, so that each UE can determine the feedback channel resource allocated for itself according to the location indication information, and perform uplink feedback on the downlink packet of the received multicast service on the determined feedback channel. Realized feedback from multiple users in the multicast service. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1(a) is a schematic structural diagram of a downlink shared control channel of a unicast service in the prior art; FIG. 1(b) is a schematic structural diagram of an uplink feedback channel of a unicast service in the prior art;

2 is an exemplary flowchart of a method for multi-user feedback in an embodiment of the present invention;

3(a) is a schematic structural diagram of a downlink shared control channel in which a multicast service exists in an embodiment of the present invention; and FIG. 3(b) is a schematic structural diagram of an uplink feedback channel in which a multicast service exists in the embodiment of the present invention; c) is a schematic structural diagram of an uplink feedback channel of each UE in a multicast service according to an embodiment of the present invention; FIG. 4 is an exemplary structural diagram of a system for multi-user feedback in an embodiment of the present invention;

Figure 5 is a schematic diagram showing the internal structure of a base station in the system shown in Figure 4;

FIG. 6 is a schematic diagram showing the internal structure of a UE in the system shown in FIG. 4. In the embodiment of the present invention, when the number of the UEs receiving the same multicast service is lower than the preset threshold, the downlink service that needs the UE feedback is performed on the multicast service, and the feedback is sent to the UE through the high layer signaling. Determining the location indication information; the UE determines the feedback channel resource allocated for itself according to the location indication information, and performs uplink feedback on the downlink packet of the received multicast service on the determined feedback channel.

In order to make the objects, the technical solutions and the advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the embodiments and drawings.

FIG. 2 is an exemplary flowchart of a method for multi-user feedback in an embodiment of the present invention. As shown in Figure 2, the process includes the following steps:

Step 201: Count the number of UEs that receive the same multicast service.

Since the location information of each UE that needs to be fed back is different, the network side can know how many UEs receive a certain multicast service at the same time, and learn the IDs of these UEs. In a specific implementation, the UE may initiate a reporting process to the network side, and notify the network side of the multicast service that the network side needs to receive or receiving, so that the network side performs statistics.

The UE may periodically report to the network side according to the preset period. Alternatively, the UE may set the reporting condition in advance. When the reporting condition is met, the UE initiates a reporting process to the network side.

In addition, the network side may also add a report indication flag (such as a feedback_flag) to the high-layer signaling, such as the MBMS control channel (MCCH), to indicate whether the network side needs the UE to report that it wants to receive or is receiving more. The broadcast service, that is, the network side sends the report indication information to the UE, and the UE reports the information of the multicast service received by the UE to the network side according to the report indication information from the network side, such as the information of the multicast service to be received or being received. The network side may periodically send the high-level signaling carrying the indication indication flag to the UE according to the preset period, or may perform the targeted delivery according to the statistical requirements. The high-level signaling indicating the identifier is reported, because the UE needs to perform uplink feedback and is related to the number of UEs. Therefore, if the network side finds that there are many UEs, the network side does not need to perform uplink feedback, that is, the location indication information is not sent to the UE. There is also no need to continue to count the number of UEs according to the UE reporting the received multicast service.

When the UE initiates the reporting process to the network side, the piggybackback may be used to carry the information of the multicast service to be received or received by the UE in the uplink message, for example, carrying the cause value of receiving the multicast service. Etc., to report the multicast service that it needs to receive or is receiving. There may be multiple uplink messages for signaling entrainment, such as: RRC Connection Request, Initial Direct Transfer, Uplink Direct Transfer, and radio resource control. RRC Connection Establishment Complete, Measurement Report, HO Complete, Cell Update Complete, General Ground Wireless Access Network Registration Area Update ( URA Update Complete ) , Physical/Transport Channel/RB Reconfiguration Complete, Counting Response, or new dedicated messages and other messages.

The network side obtains the number of UEs that receive the same multicast service according to the information reported by the UE. Step 202: Determine whether the number of UEs receiving the same multicast service is lower than a preset threshold. If not, go to step 203; otherwise, go to step 204.

The preset threshold can be set according to actual needs, such as 8, 9, 10, and so on.

Step 203: Perform downlink transmission without UE feedback on the multicast service, and end the process. In this embodiment, when the number of UEs receiving the same multicast service is higher than the preset threshold, the UE does not need to perform uplink feedback (including ACK/NACK feedback and CQI feedback), so multicast for uplink feedback is not required for the UE. Service, its downlink control signaling can use permanent scheduling (Persistent Scheduling), that is, one-time scheduling signaling can schedule multiple packet transmissions.

The permanently scheduled control signaling may be sent on a higher layer channel, such as on the MCCH, or on other channels.

Alternatively, the permanently scheduled control signaling may also be sent on the downlink shared control channel, and the signaling field of the control signaling may be consistent with the unicast case, or may be simplified, such as omitting multiple input multiple output (MIMO). Related information, modulation and coding format, antenna configuration, etc.

Alternatively, the permanently scheduled control signaling may be divided into two parts, part of the signaling (such as multi-antenna configuration, modulation and coding format, etc.) is sent on a higher layer channel, such as MCCH, and another part of signaling (such as physical resource allocation, data packets) Size, etc.) is sent on the downlink shared control channel.

Further, the control signaling of all the non-feedback multicast services transmitted in the same subframe may be jointly encoded (source coding) and occupied by one downlink shared control channel.

In addition, for multicast services that do not require UEs to perform uplink feedback, the downlink control signaling may also use a dynamic scheduling (Dynamic Scheduling) method. At this time, the dynamically scheduled control signaling can usually be sent on the downlink shared control channel, or can also be sent as other high layer signaling using other resources. In order to reduce the number of detections of the UE and save power for the UE, the dynamic scheduling time (i.e., the position in the subframe) may be indicated by the MCCH within a Modifying Period.

Step 204: Perform downlink transmission that needs feedback from the UE for the multicast service, and send the location indication information required for feedback to the UE.

In this step, for the multicast service that requires the UE to perform uplink feedback (including ACK/NACK feedback and CQI feedback), the downlink control signaling may use Dynamic Scheduling, that is, one scheduling data is scheduled once. Packet transmission.

The downlink scheduling signaling that is dynamically scheduled may be sent on the downlink shared control channel, or may be sent as other high-layer signaling using other channel resources. In order to reduce the number of detections of the UE, the UE is saved, Within a Modifying Period, the moment of dynamic scheduling (ie, the location in the subframe) may be indicated to the UE by a higher layer channel, such as the MCCH.

This step is described in detail below in several specific situations:

Case 1: When there is only one dynamically scheduled multicast service in a subframe, the control signaling of the multicast service may use the downlink shared control channel, and the signaling field may be consistent with the unicast situation, or may be Simplified (such as omitting MIM0 related fields). In order not to affect the processing of the unicast service, the downlink shared control channel occupied by the control signaling of the multicast service may be set after the downlink shared control channel occupied by the control signal of the unicast service. For example, a case where four UEs receive a unicast service and four UEs receive a multicast service is shown in FIG. 3(a), and FIG. 3(a) shows a schematic structural diagram of a downlink shared control channel when a multicast service exists. The four downlink control signalings of the unicast service respectively occupy four control channels, that is, the control channel 1 to the control channel 4, which are consistent with the structure shown in FIG. 1 (a), and the downlink control signaling of the multicast service is located in the single The control channel after the control channel is broadcasted, that is, the control channel 5. At this time, the multicast service may use an ID code different from the general UE ID. For example, the system reserves an ID for all multicast services, called MBMS ID, or may assign different IDs to different multicast services. As shown in FIG. 3(a), multiple UEs that are to receive multicast services blindly detect each control channel. When the control channel 5 is detected, if the MBMS IDs match, the UEs read correspondingly according to the indication of the control channel. The data section.

Since the multicast service uses the same downlink shared control channel as the unicast service, the first resource pool is used for the uplink feedback, and the channel position occupied by the ACK/NACK signal corresponding to the downlink data packet is scheduled and the data is scheduled. The channel position occupied by the downlink control signaling of the packet is implicitly corresponding. Therefore, the UE can determine the initial position of the uplink feedback for the multicast service according to the channel location and the implicit correspondence of the downlink control signaling, when the foregoing M is used. In the case of =N, the case where the UE occupies the ACK/NACK channel is as shown in FIG. 3(b), and FIG. 3(b) shows the structure of the uplink feedback channel when there is a multicast service, and in FIG. 3(b), The UEs of each unicast service occupy the same channel location as the control channel respectively. The ACK/NACK channel, that is, the ACK/NACK channel 1 to the ACK/NACK channel 4, performs ACK/NACK signal feedback, and the start position of the feedback of the UE of the multicast service occupies the ACK/NACK channel of the same channel position as the control channel, that is, ACK/NACK channel 5.

However, since each UE does not know that several UEs are receiving the multicast service at the same time, the specific location of the channel for which feedback is performed cannot be known. For this reason, the network side can use the high layer signaling to the UEs of the multicast service. Sending detailed location indication information required for feedback, and the location indication information may be offset information of a feedback channel of each UE in a first resource pool relative to a starting location of the multicast service feedback channel. Specifically, the UE receiving the service may be sorted, and the sequence number of the UE is used as the location offset information.

Case 2: When a subframe has multiple dynamically scheduled multicast services, different multicast services are distinguished by different IDs, and in order not to affect the unicast services, downlink control signaling of these multicast services may be located. After the control channel of the unicast service. Similarly, since the multicast service uses the same downlink shared control channel as the unicast service at this time, the first resource pool is used for the uplink feedback, since each UE does not know that there are several multicast services in total, and each Several UEs are receiving at the same time, so only the UE of the first multicast service after the unicast service can determine the multicast service according to the channel location and implicit correspondence of the downlink control signaling. The initial position of the uplink feedback is performed, but the specific location of the channel for which feedback is performed is also unknown, and the UEs of other multicast services after the first multicast service have no known location of the starting location and the specific location of the channel for feedback. For example, the network side may add a field to indicate a starting position of the uplink feedback channel corresponding to the control channel multicast service in the first resource pool in the downlink shared control channel that sends the control signaling of the multicast service, for example, The indication may be indirectly indicated by the number of the uplink feedback channels corresponding to all the multicast service control channels in front of the control channel minus the number of control channels of all the multicast services in front of the control channel, or may directly indicate that the control channel is directly The starting position of the uplink feedback channel corresponding to the broadcast service in the first resource pool. Similarly, the network side can send detailed location indication information required for feedback to each UE of each multicast service through high layer signaling. The location indication information may be offset information of a feedback channel of each UE in a first resource pool relative to a starting location of the received multicast traffic feedback channel.

Case 3: The control channel occupied by the downlink control signaling of the multicast service may have other distribution modes in addition to the control channel of the unicast service. For example, a multicast service is randomly set between the control channels of the unicast service. In this case, in the downlink shared control channel that sends the unicast service, a field is added to indicate the location of the uplink feedback channel corresponding to the unicast service, and In the downlink shared control channel of the multicast service, a field is added to indicate the starting position of the uplink feedback channel corresponding to the multicast service. Wherein, when the location or the starting location indication is performed, the number of uplink feedback channels corresponding to the service control channel before the control channel service may also be indirectly indicated. In addition, the detailed location indication information required for the feedback may be sent to the UEs of the multicast services by using the high-level signaling, where the location indication information may be that the feedback channel of each UE is more received in the first resource pool. Offset information of the starting position of the broadcast service feedback channel.

Case 4: In addition to transmitting downlink control signaling using the same downlink shared control channel as the unicast service, the multicast service may also use the resources of the higher layer signaling to transmit downlink control signaling. However, whether the downlink control channel is transmitted by using the same downlink shared control channel as the unicast service, or the downlink control signaling is transmitted by using the resources of the higher layer signaling, and the network side can use the second resource pool for the uplink feedback. The signaling sends detailed location indication information required for feedback to each UE, where the location indication information may be a specific channel location of the feedback channel of each UE in the second resource pool.

Step 205: The UE determines, according to the received location indication information, a channel resource that performs uplink feedback, and performs uplink feedback on the downlink packet of the received multicast service on the determined corresponding feedback channel.

After receiving the location indication information from the network side, the UE may save the location indication information, and the UE may also return the received acknowledgement information to the network side. This step is described in detail below for each of the cases listed in step 204. For the first case in step 204, in this step, the UE determines, according to the channel location of the downlink shared control channel that receives the multicast service control signaling, and the preset implicit correspondence, that the multicast service is performed in the first resource pool. The initial position of the feedback channel of the uplink feedback is determined according to the offset information of the feedback channel of each UE indicated by the location indication information from the high layer signaling in the first resource pool relative to the start position of the multicast service feedback channel. The channel location in the first resource pool for uplink feedback is the uplink feedback channel resource allocated by itself, and uplink feedback is performed on the downlink data packet of the received multicast service on the uplink feedback channel of the corresponding channel location. The following is an example of the case where the foregoing four UEs receive the unicast service and the four UEs receive the multicast service. FIG. 3(c) shows a schematic structural diagram of the uplink feedback channel of each UE in the multicast service, in the multicast service. The UE determines the uplink feedback channels of the ACK/NACK channel 5 to the ACK/NACK channel 8 as shown in FIG. 3(c) according to the location indication information, and performs feedback on the respective uplink feedback channels.

For the second case in step 204, in this step, the UE that receives the first multicast service is determined to be in the first resource pool according to the channel location of the downlink shared control channel receiving the control signaling and the preset implicit correspondence relationship. The multicast service performs the feedback channel start position of the uplink feedback, or if the indication field is set in the downlink shared control channel, the UE may determine, according to the indication information in the indication field, that the multicast service is uplinked in the first resource pool. a feedback feedback channel start location; the UE receiving the other multicast service determines the start position of the uplink feedback channel corresponding to the multicast service according to the indication information in the indication field of the channel for receiving the downlink control signaling, such as a direct use indication The initial feedback channel corresponding to the multicast service indicated by the field in the first resource pool, or the number of uplink feedback channels corresponding to all previous multicast service control channels indicated in the indication field is subtracted The difference in the number of control channels of all the previous multicast services, and according to the location of the control channel of the multicast service, Before the multicast traffic in a resource pool corresponding to a first uplink feedback channel start position. After that, the UEs of each multicast service are based on The offset information of the feedback channel of each UE phase indicated by the location indication information of the high layer signaling in the first resource pool relative to the starting location of the multicast service received by the UE is determined to be performed in the first resource pool. The channel position of the uplink feedback is uplink feedback of the downlink data packet of the received multicast service on the uplink feedback channel of the corresponding channel position.

For the third case in step 204, in this step, the UE of the unicast service obtains the location of the uplink feedback channel corresponding to the service received by the UE from the indication field of the channel that receives the downlink control signaling, and the UE receives control from the multicast service. The indication field of the downlink shared control channel of the signaling obtains the starting position of the uplink feedback channel corresponding to the service received by the UE, and then the UE of the multicast service according to the location indication information of the higher layer signaling indicates the feedback channel of each UE. Determining the channel position of the first resource pool for uplink feedback in the first resource pool relative to the offset information of the starting location of the multicast service received by itself, and on the uplink feedback channel of the corresponding channel location The downlink data packet of the received multicast service is uplink feedback.

For the fourth case in step 204, in this step, each UE directly determines the specific channel location for performing uplink feedback in the second resource pool according to the indication of the location indication information from the high layer signaling, and uplink feedback at the corresponding channel location. Uplink feedback is performed on the downlink data packet of the received multicast service on the channel.

Further, when the number of UEs is gradually increased from a preset threshold to a preset threshold, the network side may consider that the distribution of the UE is random at this time, and no single UE needs to perform feedback, and the network side may cancel the previous pair. The location of some UEs indicates the setting of information. Among them, there are at least two methods for canceling the location indication information: one uses a dedicated signaling method, and the other uses a broadcast mode. For example, the UE with the location indication information may be notified by the dedicated signaling to release the location indication information; or the location indication information of the UE receiving the certain multicast service is indicated as a Disable state by using a Broadcast Control Channel (BCCH); Or alternatively, the location indication information of the UE that receives a certain multicast service is indicated by the MCCH as Can (Disable) state.

When the number of UEs is gradually reduced, from above the preset threshold to below the preset threshold, the network side may restart the location indication information. There are at least two methods for starting location indication information: one uses dedicated signaling and the other uses broadcast. For example, the location indication information may be set for the existing UE that receives the multicast service by using dedicated signaling; or the location indication information of the UE that receives the multicast service is indicated as an Enable state by using the BCCH; or, The MCCH indicates that the location indication information of the UE receiving the multicast service is an Enable state.

When a multicast service needs to change the scheduling mode of signaling due to the increase or decrease of the number of receiving users, for example, when the number of people increases to a preset threshold, in order to save resources, the dynamic scheduling mode may be modified to be permanently scheduled. In this manner, in order not to affect the UE's reception, the scheduling form of the signaling and the corresponding data packet scheduling may be changed at the beginning of the next modification period. That is, when the number of UEs is changed from the preset threshold to the preset threshold, the downlink transmission required by the UE for the multicast service is changed to the downlink transmission without the UE feedback when the next modification period starts; When the number is changed from the preset threshold to the preset threshold, the downlink transmission of the multicast service without UE feedback is changed to the downlink transmission requiring UE feedback at the beginning of the next modification period. The scheduling form used by the multicast service may be indicated in the MCCH, but is not limited to being indicated in the MCCH.

In addition, when one of the following situations occurs, the location indication information of the UE needs to be updated, including the release or reconstruction of the location indication information.

Case 1: When the UE releases the received multicast service, the location indication information is released.

When the UE is no longer receiving the current multicast service, the UE may further initiate the uplink signaling to notify the network side to leave, and the network side may delete all the resources used by the UE, including the channel resources used by the UE for uplink feedback, that is, release the UE. Location indication information.

Case 2: When the UE cell is reselected or the cell is updated to another cell, the location indication information is released or heavily Built.

When the UE performs the cell reselection or the cell update to another cell in the process of receiving the multicast service, the UE may notify the network side of the received multicast service information by using the cell update message, when the new cell does not support When the UE receives the multicast service, the network side releases the resources used by the UE, including the channel resources used by the UE for uplink feedback; when the new cell supports the multicast service received by the UE, the new cell may receive the multicast service according to the The number of UEs is allocated to the UE for new channel resources for uplink feedback, that is, the UE sends new location indication information, and notifies the old cell to release the resources used by the UE, including releasing the old location indication information.

Case 3: When the UE switches to another cell, the location indication information is released or reconstructed.

When the UE is handed over to another cell, if the UE has reported the situation of receiving the multicast service to the network side of the source cell, and the network side of the source cell has allocated the uplink feedback resource for the UE, that is, the location indication information has been sent. If the uplink feedback resource is not released, the source cell may notify the target cell of the situation of the multicast service received by the UE by using the handover request message; or if the UE does not report the situation of receiving the multicast service to the network side of the source cell, The UE may inform the target cell in the handover complete message that the UE itself receives the multicast service.

When the target cell supports the multicast service received by the UE, the target cell may allocate a new uplink feedback channel resource to the UE in the handover request response or in the connection establishment after the UE switches to the target cell, that is, send a new message to the UE. The location indication information, in addition, the target cell notifies the source cell to delete the original resource used by the UE, including the channel resource used by the UE for uplink feedback, that is, the location indication information of the original cell release UE; when the target cell does not support the UE received multicast During the service, the target cell may directly notify the source cell to delete the resources used by the UE, including the channel resources used by the UE for uplink feedback.

Case 4: When the UE is added, the location indication information is updated.

When the number of UEs receiving a certain multicast service is maintained below a preset threshold, its members may also The UEs are constantly changing, some UEs are joining, and some UEs are joining, leaving the UEs, as described in the above scenarios, releasing the resources used by them, including resources used for uplink feedback. When a new user joins, the network side can assign the remaining valid location indication information to the new UE.

In addition, in the above four cases, in addition to updating the location indication information of the changed UE, the uplink feedback resources of all UEs that need to perform feedback may be reallocated when the above four situations occur, that is, The location indication information is sent to all UEs that need to perform feedback.

When the location indication information is released, the UE that needs to release the resource may be notified by the dedicated signaling to release the location indication information.

The foregoing method is a preferred embodiment of the present invention. In a specific implementation, if the network side can know in advance the number of UEs receiving the same multicast service and the ID of each UE, step 201 may be omitted. The system for performing uplink feedback in the embodiment is described in detail.

FIG. 4 is an exemplary structural diagram of a system for uplink feedback in an embodiment of the present invention. As shown in FIG. 4, the system includes: a base station and a UE.

The base station is configured to count the number of UEs that receive the same multicast service, and when the number of the UEs that receive the same multicast service is lower than the preset threshold, perform downlink transmission that requires UE feedback, and The location indication information required for feedback is sent to the UE. The location indication information can be delivered through high-level signaling.

The UE is configured to determine, according to the location indication information, a channel resource for performing uplink feedback, and perform uplink feedback on the downlink packet of the received multicast service on the determined feedback channel.

In a specific implementation, the specific operation process of the base station and the UE may be consistent with the operation process described in the method flow shown in FIG. 2, and is not described here. Similarly, if the base station can know in advance the number of UEs receiving the same multicast service and the ID of each UE, the number of UEs that receive the same multicast service may not need to be counted. Wherein, when the base station is specifically implemented, there may be various internal structure implementation forms, and FIG. 5 shows one of the internal structure diagrams. As shown in the solid line in FIG. 5, the base station may include: a statistics module, a first downlink transmission module, and an information delivery module.

The statistics module is configured to count the number of user equipment UEs that receive the same multicast service. The first downlink transmission module is configured to: when the statistics module determines that the number of UEs receiving the same multicast service is lower than a preset threshold, The multicast service performs downlink transmission that requires UE feedback;

The information sending module is configured to send the location indication information required for the feedback to the UE when the statistic module determines that the number of the UEs that receive the same multicast service is lower than the preset threshold.

The base station may further include a first receiving unit (not shown), configured to receive uplink feedback of the downlink data packet of the multicast service by the UE on an uplink feedback channel determined according to the location indication information.

Wherein, if the base station can know in advance the number of UEs receiving the same multicast service and the ID of each UE, the base station may not need to include a statistics module.

Further, as shown by the dotted line in FIG. 5, the base station may further include: a second downlink transmission module, configured to: when the statistics module determines that the number of UEs receiving the same multicast service is higher than a preset threshold, The multicast service performs downlink transmission without UE feedback.

In the specific implementation, corresponding to a situation in the method flow shown in FIG. 2, that is, the network side sends the indication information to the UE, and the statistics module may include: the indication delivery module and the statistics execution module.

The indication sending module is configured to send the reporting indication information to the UE.

The statistics execution module is configured to count, according to the information about the received multicast service reported by the UE, such as the multicast service information to be received or receiving, the number of UEs that receive the same multicast service.

In addition, in the specific implementation, corresponding to Case 4 to Case 4 described in the method flow shown in FIG. 2, The first downlink transmission module in a specific implementation structure may include: a first signaling scheduling module, and/or a second signaling scheduling module, and/or a third signaling scheduling module, and, a data packet Send module.

The first signaling scheduling module is configured to send the control signaling of the multicast service on the downlink shared control channel, and use the control signaling, when there is only one dynamically scheduled multicast service in one subframe. The downlink shared control channel is set after the downlink shared control channel occupied by the control signaling of the unicast service.

The second signaling scheduling module is configured to: when there are multiple dynamically scheduled multicast services in one subframe, send control signaling of each multicast service on a downlink shared control channel, and control signals of each multicast service After the downlink shared control channel occupied by the control signaling of the unicast service is set, the downlink shared control channel occupied by the control signaling of each multicast service is set to indicate the uplink corresponding to the corresponding multicast service. Information about the starting position of the feedback channel.

The third signaling scheduling module is configured to send the control signaling of the multicast service on the downlink shared control channel or on the upper layer channel.

The data packet sending module is configured to send downlink data packets of the multicast service on the downlink data channel.

In a specific implementation, corresponding to case 4 to case 4 described in the method flow shown in FIG. 2, the base station may further include: an information update module, configured to: when the UE releases the received multicast service, or when the UE performs cell reselection or When the cell is updated to another cell, or when the UE switches to another cell, or when the number of UEs is lower than the preset threshold, the location indication information of the UE is updated. When the location indication information of the UE is updated, the release or reallocation of the delivery may be specifically included.

In addition, in a specific implementation, corresponding to the case where the number of UEs described in the method flow shown in FIG. 2 changes from a preset threshold to a preset threshold or from a preset threshold to a preset threshold. The base station may further include: an information canceling or restarting module, configured to change the number of UEs from a lower threshold than a preset threshold When the threshold is preset, the location indication information of the UE is cancelled; when the number of UEs is changed from a preset threshold to a preset threshold, the location indication information of the UE is restarted. Among them, cancel and specifically include release and de-enable, etc., restart may specifically include reconstruction and enabling.

Wherein, when the UE is specifically implemented, there may be various internal structure implementation forms, and FIG. 6 shows one of the internal structure diagrams. As shown in the solid line in FIG. 6, the user equipment may include: an information receiving module, a feedback channel determining module, and an uplink feedback module.

The information receiving module is configured to receive location indication information that is sent by the network side by using the high layer signaling. The feedback channel determining module is configured to determine, according to the location indication information received by the information receiving module, a channel resource that the UE performs uplink feedback.

The uplink feedback module is configured to perform uplink feedback on the downlink data packet of the multicast service received by the UE on the feedback channel determined by the feedback channel determining module.

In a specific implementation, corresponding to Case 4 to Case 4 described in the method flow shown in FIG. 2, the feedback channel determining module may include: a first resource pool feedback channel determining module, and/or a second resource pool feedback channel determining module.

The first resource pool feedback channel determining module is configured to use, according to the location indication information received by the information receiving module, the offset information of the feedback channel of the UE in the first resource pool relative to the start position of the multicast service feedback channel. Determining a starting location of the multicast service feedback channel, and determining channel resources for performing uplink feedback in the first resource pool.

The second resource pool feedback channel determining module is configured to determine channel resources for performing uplink feedback in the second resource pool according to channel positions of the feedback channels of the UEs in the second resource pool in the location indication information received by the information receiving module.

In addition, the user equipment may further include: a multicast information reporting module, configured to report, to the network side, information that the user receives the multicast service, such as the multicast service information to be received or being received. The base station described in the foregoing embodiment may be a Node Node (NodeB), an evolved base station (eNodeB), or the like.

In this document, the resources occupied by the uplink CQI are displayed by the base station through the downlink control signaling. Therefore, the location indication of the CQI occupied resource is not described in detail in this document. The resources occupied by the uplink CQI can still pass the downlink control signal. To display the notification, the UE feeds back the CQI based on the notification.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary hardware platform, and of course, all can be implemented by hardware, but in many cases, the former is better. Implementation. Based on such understanding, all or part of the technical solution of the present invention contributing to the background art may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM, a magnetic disk, an optical disk, or the like. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

The above described specific embodiments of the present invention are further described in detail, and it is to be understood that the foregoing description is only the preferred embodiments of the present invention The scope of the present invention is intended to be included within the scope of the present invention. Any modifications, equivalents, improvements, etc., are included in the scope of the present invention.

Claims

Rights request

A method for multi-user feedback, characterized in that the method comprises:

The method according to claim 1, wherein the determining, according to the location indication information, the uplink feedback channel comprises:

Determining, according to the channel location of the downlink shared control channel of the received multicast service control signaling, and a preset implicit correspondence, determining a starting position of the multicast service feedback channel in the first resource pool, according to the determining Determining, in the location information, the offset information of the feedback channel of each UE in the first resource pool relative to the start position of the multicast service feedback channel, determining the channel resource for performing uplink feedback in the first resource pool .

The method according to claim 1, wherein the determining, according to the location indication information, that the uplink feedback channel comprises:

Determining, according to the indication information in the downlink shared control channel of the received multicast service control signaling, a starting location of the received multicast service feedback channel in the first resource pool, according to the determined starting location and the location Determining the channel information of the feedback channel of each UE in the first resource pool relative to the start position of the received multicast service feedback channel, and determining the channel resources for performing uplink feedback in the first resource pool, where each The downlink shared control channel occupied by the control signaling of the broadcast service is set after the downlink shared control channel occupied by the control signaling of the unicast service, and the indication information in the downlink shared control channel is an uplink feedback channel corresponding to the corresponding multicast service. The starting position information.

4. The method according to claim 1, wherein the determining according to the location indication information, Determining the uplink feedback channel includes:

Channel resources for performing uplink feedback in the second resource pool are determined according to channel locations of the feedback channels of the UEs in the second resource pool in the location indication information.

The method of claim 1, wherein before the receiving the location indication information, the method further comprises:

And reporting information about receiving the multicast service to the network side according to the received reporting indication information sent by the network side;

Or, when the reporting criterion is met, the network side reports the information of the multicast service received by itself.

The method according to claim 5, wherein the reporting, by the network side, information about receiving the multicast service according to the reporting indication information includes:

The UE carries the information of the multicast service that is to be received or is being received by the UE in the uplink message and reports it to the network side.

The method according to claim 6, wherein the uplink message comprises: a radio resource control connection request, an initial direct transmission, an uplink direct transmission, a radio resource control connection establishment completion, a measurement report, a handover completion, and a cell update. Completion, general terrestrial radio access network registration area update completion, physical/transport channel/radio bearer reconfiguration complete, statistical response message or new dedicated message.

8. A downlink transmission method, comprising:

The downlink transmission method according to claim 8, wherein the method further comprises: receiving, by the UE, a downlink data packet of the multicast service on an uplink feedback channel determined according to the location indication information. Upstream feedback.

The method according to claim 8, wherein the method further comprises: counting the number of UEs receiving the same multicast service according to the information that the UE receives the multicast service reported by the UE.

The method according to claim 8, wherein the performing the downlink transmission that requires feedback from the UE for the multicast service, and delivering the uplink feedback required for the multicast service to the UE Location indication information includes:

Controlling signaling of the multicast service is transmitted to the UE in a dynamic scheduling manner;

The location indication information required for performing uplink feedback on the multicast service is transmitted to the UE in a manner of high layer signaling.

The method according to claim 11, wherein the transmitting the control signaling of the multicast service to the UE in a dynamic scheduling manner comprises:

When there is only one dynamically scheduled multicast service in a subframe, the control signaling of the multicast service is sent to the UE on the downlink shared control channel;

The location indication information includes: offset information of a feedback channel of each UE in a first resource pool relative to a starting location of the received multicast service feedback channel.

When there are multiple dynamically scheduled multicast services in a subframe, the control signaling of each multicast service is sent to the UE on the downlink shared control channel, and the downlink shared control channel occupied by the control signaling of each multicast service is used. After the downlink shared control channel occupied by the control signaling of the unicast service is set, the information indicating the start position of the uplink feedback channel corresponding to the corresponding multicast service is set in the downlink shared control channel occupied by the control signaling of the multicast service. ;

The location indication information includes: a feedback channel of each UE in the first resource pool relative to the received Offset information of the starting position of the multicast service feedback.

The method according to claim 8, wherein the downlink transmission that requires UE feedback is performed on the multicast service, and the location indication required for uplink feedback of the multicast service is sent to the UE. Information includes:

Transmitting the control signaling of the multicast service to the UE on the downlink shared control channel, or transmitting the signal to the UE on the upper layer channel;

And transmitting the location indication information required for uplink feedback to the multicast service to the UE by using high layer signaling;

The location indication information includes: a channel location of a feedback channel of each UE in a second resource pool.

The method according to any one of claims 12 to 14, wherein, when the control signaling of the multicast service is sent to the UE on the downlink shared control channel, the dynamic scheduling is performed within a modification period. The time is indicated to the UE by the higher layer channel.

The method according to any one of claims 8 to 10, wherein the method further comprises: sending a pair to the UE when the number of UEs receiving the same multicast service is higher than a preset threshold The multicast service performs downlink transmission without UE feedback.

The method according to claim 16, wherein the performing downlink transmission without the UE feedback on the multicast service comprises: performing control signaling on the multicast service to a UE by using a permanent scheduling manner transmission.

The method according to claim 17, wherein the transmitting the control signaling of the multicast service to the UE in a persistent scheduling manner comprises: permanently scheduling control signaling of the multicast service Sending to the UE on the high layer signaling;

Or the method includes: transmitting, to the UE, the persistent scheduling control signaling of the multicast service on the downlink shared control channel; Or the method includes: dividing the permanent scheduling control signaling of the multicast service into two parts, part of the signaling is sent to the UE on the upper layer channel, and another part of the signaling is sent to the UE on the downlink shared control channel.

The method according to any one of claims 8 to 14, wherein the method further comprises:

When the number of UEs receiving the same multicast service changes from a preset threshold to a preset threshold, the location indication information of the UE is cancelled.

The method according to claim 19, wherein the method further comprises: when the number of UEs receiving the same multicast service changes from a preset threshold to a preset threshold, in the next When the modification period starts, the network side changes the downlink transmission of the multicast service that needs feedback from the UE to the downlink transmission that does not require UE feedback.

The method according to claim 19, wherein the method further comprises: when the number of UEs receiving the same multicast service changes from a preset threshold to a preset threshold, restarting The location indication information of the UE.

The method according to claim 21, wherein the method further comprises: when the number of UEs receiving the same multicast service changes from a preset threshold to a preset threshold, in the next When the modification period starts, the network side changes the downlink transmission of the multicast service without UE feedback to the downlink transmission that requires UE feedback.

The method according to claim 21, wherein the canceling the location indication information of the UE comprises: the network side notifying the location indication information by using dedicated signaling or by using a broadcast control channel or by using a control channel of the multicast service. The UE cancels the location indication information;

The location indication information of the restarting UE includes: the network side notifying the UE to restart the location indication information by using dedicated signaling or by using a broadcast control channel or by using a control channel of the multicast service.

The method according to any one of claims 8 to 14, wherein the method One step includes:

When the UE releases the received multicast service, releasing the location indication information of the UE;

When the UE performs cell reselection or cell update to another cell, the source cell releases the location indication information of the UE;

When the UE switches to another cell, the source cell releases the location indication information of the UE;

When the number of UEs is lower than the preset threshold, the remaining valid location indication information is sent to the newly added UE.

25. A system for multi-user feedback, wherein the system comprises:

The base station is configured to perform downlink transmission that needs feedback from the UE for the multicast service when the number of the UEs that receive the same multicast service is lower than the preset threshold, and send uplink feedback to the multicast service to the UE. Required location indication information;

The user equipment UE is configured to determine, according to the location indication information, a channel for performing uplink feedback, and perform uplink feedback on the downlink data packet of the received multicast service on the determined feedback channel.

26. A base station, the base station comprising:

And an information sending module, configured to send, to the UE, location indication information required for feedback when the number of UEs that receive the same multicast service is lower than a preset threshold.

The base station according to claim 26, wherein the base station further comprises:

The first receiving unit is configured to receive uplink feedback of the downlink data packet of the multicast service by the UE on an uplink feedback channel determined according to the location indication information.

The base station according to claim 26, wherein the base station further comprises: a second downlink transmission module, configured to: when the number of UEs receiving the same multicast service is higher than a preset threshold, The multicast service performs downlink transmission without UE feedback.

The base station according to any one of claims 26 to 28, wherein the base station further comprises: a statistics module, configured to count the number of user equipment UEs that receive the same multicast service.

The base station according to claim 29, wherein the statistic module includes: an indication sending module, configured to send a report indication information to the UE; and/or

The statistics execution module is configured to collect, according to the information about the received multicast service reported by the UE, the number of UEs that receive the same multicast service.

The base station according to any one of claims 26 to 28, wherein the first downlink transmission module includes a first signaling scheduling module, a second signaling scheduling module, and a third signaling scheduling module. At least one of them and a packet sending module,

The first signaling scheduling module is configured to: when there is only one dynamically scheduled multicast service in one subframe, send the control signaling of the multicast service on a downlink shared control channel, and send the control signaling The occupied downlink shared control channel is set after the downlink shared control channel occupied by the control signaling of the unicast service;

The second signaling scheduling module is configured to: when there are multiple dynamically scheduled multicast services in one subframe, send control signaling of each multicast service on a downlink shared control channel, and send each multicast service The downlink shared control channel occupied by the control signaling is set in the downlink shared control channel occupied by the control signaling of the unicast service, and the corresponding multicast service is set in the downlink shared control channel occupied by the control signaling of each multicast service. Information about the starting position of the corresponding uplink feedback channel;

The third signaling scheduling module is configured to send the control signaling of the multicast service on the downlink shared control channel, or send the signal on the upper layer channel;

The base station according to any one of claims 26 to 28, wherein the base station further comprises:

An information update module, configured to: when the UE releases the received multicast service, or when the UE performs cell reselection or cell update to another cell, or when the UE switches to another cell, or receives the same multiple When the number of UEs of the broadcast service is lower than the preset threshold, the location indication information of the UE is updated when the UE is added.

And the information cancellation or restarting module is configured to cancel the location indication information of the UE when the number of UEs that receive the same multicast service changes from a preset threshold to a preset threshold; When the preset threshold becomes lower than the preset threshold, the location indication information of the UE is restarted.

34. A user equipment, where the user equipment includes:

An information receiving module, configured to receive location indication information that is sent by the network side;

The user equipment according to claim 34, wherein the feedback channel determining module comprises:

a first resource pool feedback channel determining module, configured to: according to the position indication information received by the information receiving module, offset information of a feedback channel of the UE in a first resource pool relative to a start position of a multicast service feedback channel, and Determining a starting location of the multicast service feedback channel, and determining a channel resource for performing uplink feedback in the first resource pool; And/or, the second resource pool feedback channel determining module, configured to determine, according to the channel location of the feedback channel of each UE in the second resource pool, in the location indication information received by the information receiving module, in the second resource pool Channel resources for uplink feedback.

The user equipment according to claim 34 or claim 35, wherein the user equipment further comprises: a multicast information reporting module, configured to report information about receiving the multicast service to the network side.