WO2010102453A1

WO2010102453A1 - Method, communication system and protocol entity for improving performance of relay network system

Info

Publication number: WO2010102453A1
Application number: PCT/CN2009/070764
Authority: WO
Inventors: 张涛
Original assignee: 华为技术有限公司
Priority date: 2009-03-12
Filing date: 2009-03-12
Publication date: 2010-09-16
Also published as: CN102369784A; CN102369784B

Abstract

A method, communication system and protocol entity for improving the performance of relay network system are disclosed by embodiments of the present invention. The method comprises: relay radio link control (RRLC) layer entity receives the packets transmitted by at least two packet data convergence protocol (PDCP) layer entities; RRLC entity aggregates the packets; and RRLC entity transmits the aggregated packets to the radio link control (RLC) layer entity, thereby enabling the aggregated packets to be transmitted to the receiving device via RLC layer, MAC layer, and L1 layer. Utilizing the solution provided by embodiments of the present invention, the system performance of the relay network system is enhanced by making full use of the transmission resource over the wireless link from relay station to base station.

Description

Method, communication system and protocol entity for improving performance of relay network system

The present invention relates to the field of communications technologies, and in particular, to a method, a communication system, and a protocol entity for improving performance of a relay network system.

Background technique

Since the IMT-Advanced system requires a high system capacity, the higher frequency band provides the IMT-Advanced system with a large bandwidth spectrum that satisfies its capacity, and the path loss and penetration loss of such a high frequency band are both Larger, making it difficult for the base station to achieve good coverage at the cell edge. Therefore, in order to meet the capacity requirements of IMT-Advanced, the LTE_Advanced technology proposed by the 3GPP (3rd Generation Partnership Project) Relay technology is being studied as a candidate for improving system capacity and coverage.

In a traditional network, the wireless connection between the base station and the terminal is a direct wireless connection, that is, a single-hop network. The relay technology adds one or more relay stations between the base station and the terminal, and the relay station is responsible for performing one or more signal processing or direct forwarding of the wireless signals transmitted by the base station until the base station transmitting signals are transmitted to the terminal. Taking a simple two-hop relay as an example, a base station-terminal radio link is divided into two radio links: a base station to a relay station and a relay station to a terminal, thereby having the opportunity to replace one poor quality link with two. Better quality links for higher link capacity and better coverage. 3GPP requires that the LTE-Advanced network have good backward compatibility for LTE terminals, that is, it is required to allow the LTE terminal to obtain access services from the relay station without changing any behavior characteristics of the existing LTE terminals. This determines that the relay-to-terminal link can support the interface between the base station and the terminal in the original LTE network, that is, the Uu interface. There is no uniform regulation for the interface used on the wireless link from the relay station to the base station. In the prior art, the Uu interface is generally used directly.

According to the relevant standards of the 3GPP protocol, the protocol stack of the Uu interface user plane is divided into four protocol sublayers, namely: PDCP (Packet Da ta Convergence Protocol) Layer, RLC (Radio Link Control Layer) layer, MAC (Memed ium Acces s Cont ro l) layer and LI (Layer 1 , ie, physical layer) layer.

In the prior art, one radio bearer of a higher layer corresponds to one PDCP entity in the PDCP layer, and the PDCP entity corresponds to one RLC entity in the RLC layer, that is, the PDCP entity and the RLC entity are corresponding. Taking the uplink communication process from the relay station to the base station as an example, when receiving a data packet on the upper layer radio bearer, one of the PDCP entities in the relay station outputs a PDCP protocol data unit, that is, a PDCP PDU. The RLC entity will re-segment and aggregate the received PDCP PDUs to output RLC PDUs. The MAC layer uniformly modulates the RLC PDUs generated by all RLC entities, but only packets from the same terminal are multiplexed onto the same transport channel and then sent to the base station through the L1 layer. After receiving the data through the L1 layer, the base station performs reverse operations on the data packet with respect to the relay station in the MAC layer, the RLC layer, and the PDCP layer, thereby completing the uplink receiving process of the data.

In the process of implementing the present invention, the inventors have found that at least the following problems exist in the prior art: According to the existing data transmission mode, data transmitted on each transmission channel on the radio link from the relay station to the base station is limited to only one Terminal data. Due to the limitation of the limited transmission slot resources, the capacity of the transmission channel between the relay station and the base station is much larger than that of the previous transmission channel between the terminal and the base station. Therefore, if the data of the terminal is still transmitted according to the existing transmission mode, a huge waste of radio resources will be caused, and the relay station to the base station link becomes a transmission bottleneck of the system. Summary of the invention

Embodiments of the present invention provide a method, a communication system, and a protocol entity for improving performance of a relay network system to optimize system performance of the relay network system.

The embodiment of the invention uses the following technical solutions:

A method for improving the performance of a relay network system, comprising:

Service aggregation layer The RRLC entity receives data packets sent by at least two packet data convergence protocol layer PDCP entities;

The RRLC entity aggregates the data packet; The data packet after the convergence operation is sent to the radio link control layer RLC entity, so that the data packet after the aggregation operation is transmitted to the receiving device through the radio link control layer, the medium access control layer, and the L1 layer.

A protocol entity, including:

a receiving unit, configured to receive a data packet sent by at least two packet data convergence protocol layer PDCP entities on the relay station/base station side;

a convergence unit, configured to perform a convergence operation on the data packet received by the receiving unit;

a sending unit, configured to send the aggregated data packet received by the aggregation unit to a radio link control layer RLC entity on the relay station/base station side, so that the data packet after the aggregation operation passes through the radio link control layer and the media The access control layer and the L1 layer are transmitted to the base station/relay station.

A communication system, comprising: at least two packet data convergence protocol layer PDCP entities, a service convergence layer RRLC entity, and a radio link control layer RLC entity; wherein the PDCP entity is located at a packet data convergence protocol layer, and the RRLC entity is located at a service convergence layer, The RLC entity is located at the radio link control layer, and the service aggregation layer is located between the packet data convergence protocol layer and the radio link control layer;

a PDCP entity, configured to send a data packet from a higher layer to an RRLC entity;

An RRLC entity, configured to perform aggregation operation on data packets sent by at least two PDCP entities, and send the data packet after the aggregation operation to the RLC entity;

An RLC entity, configured to perform a split/aggregate operation on a received data packet after the aggregation operation. The method, the communication system and the protocol entity for improving the performance of the relay network system in the embodiment of the present invention overcome the present by transmitting the data packets of the radio bearers of at least two terminals through a transmission channel by the newly added RRLC entity. In the prior art, a defect of wasting radio resources caused by transmitting a data packet of a radio bearer corresponding to one terminal through one transmission channel. Thus, the embodiments of the present invention make full use of the transmission resources on the radio link from the relay station to the base station, thereby optimizing the system performance of the relay network system.

A method for improving the performance of a relay network system, comprising:

The service aggregation layer RRLC entity receives the data packet sent by the sending device, where the data packet is transmitted to the service convergence layer via the L1 layer, the medium access control layer, and the radio link control layer; The RRLC entity performs a deaggregation operation on the data packet;

The data packet of the deaggregation operation is sent to the corresponding packet data convergence protocol layer PDCP entity. A protocol entity, including:

a receiving unit, configured to receive a data packet sent by the relay station/base station, where the data packet is transmitted by the L1 layer of the base station/relay station side, the radio link control layer, and the medium access control layer;

a de-aggregation unit, configured to perform a de-aggregation operation on the data packet received by the receiving unit, and a sending unit, configured to send the data packet after the de-aggregation operation received by the de-aggregation unit to the packet data corresponding to the base station/relay station side Convergence protocol layer PDCP entity.

An RLC entity, configured to perform a split/aggregate operation on the received data packet, and send the processed data packet to the RRLC entity;

An RRLC entity, configured to perform a deaggregation operation on the data packet sent by the RLC entity, and send the data packet after the deaggregation operation to the corresponding PDCP entity;

A PDCP entity, configured to receive a data packet sent by an RRLC entity.

The method, the communication system, and the protocol entity for improving the performance of the relay network system are respectively sent by the newly added RRLC entity, and the data packets of the radio bearers of at least two terminals transmitted through one transport channel are separately sent. The corresponding terminal overcomes the defect of wasting radio resources caused by transmitting a data packet of a radio bearer corresponding to one terminal through one transmission channel in the prior art. Therefore, the embodiment of the present invention makes full use of the transmission resources on the wireless link from the relay station to the base station, thereby optimizing the system performance of the relay network system.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, a brief description of the drawings to be used in the description of the embodiments will be briefly made. It is obvious that the drawings in the following description are only Some embodiments of the invention may be obtained by those of ordinary skill in the art from the drawings without departing from the scope of the invention.

1 is a schematic diagram of a protocol architecture established based on the principles of an embodiment of the present invention;

2 is a schematic diagram of a communication system according to an embodiment of the present invention;

3 is a schematic diagram of a communication system according to an embodiment of the present invention;

4 is a flowchart of a method for improving performance of a relay network system according to Embodiment 3 of the present invention;

5 is a schematic diagram of an RRLC PDU according to Embodiment 3 of the present invention;

6 is still another schematic diagram of an RRLC PDU according to Embodiment 3 of the present invention;

FIG. 7 is a flowchart of a method for improving performance of a relay network system according to Embodiment 3 of the present invention; FIG. 8 is a flowchart of a method for improving performance of a relay network system according to Embodiment 4 of the present invention; Schematic diagram of the seven protocol entities;

FIG. 10 is a schematic diagram of a protocol entity according to Embodiment 8 of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In the embodiment of the present invention, there are two directions of communication on the radio link from the relay station to the base station. We refer to the communication in the direction of the relay station to the base station as the uplink, and the communication in the direction from the base station to the relay station as the downlink. Different from the Uu interface between the relay station and the base station in the prior art, the embodiment of the present invention improves the Uu interface between the relay station and the base station, and the improved interface between the relay station and the base station is called Uu'. interface.

The Uu, the protocol stack of the interface has five sublayers, namely: a PDCP layer, an RRLC layer (Re l ay RLC, a service aggregation layer), an RLC layer, a MAC layer, and an L1 layer. The PDCP layer, the RLC layer, the MAC layer, and the L1 layer have the same definitions as the protocol sublayers of the Uu interface in the 3GPP standard. And, the PDCP layer includes multiple PDCP entities, and the RRLC layer includes multiple RRLC entities, and the RLC layer includes Multiple RLC entities.

In the embodiment of the present invention, one radio bearer of a higher layer is still associated with one PDCP entity of the PDCP layer, but multiple PDCP entities are first associated with one RRLC entity before being associated with the RLC entity, and then the RRLC entity Associated to an RLC entity. In other words, unlike the prior art, the PDCP entity has a many-to-one relationship with the RRLC entity, and the RRLC entity and the RLC entity have a one-to-one relationship, so the PDCP entity and the RLC entity implement a many-to-one relationship. relationship. It is through such a configuration relationship that data packets on radio bearers from different terminals are aggregated by the RRLC entity into the same RRLC PDU (Protoco l Da ta Un it, protocol data unit) and transmitted to the RLC entity for segmentation and aggregation. And further multiplexed to the same transmission channel by the MAC layer entity, thereby achieving the purpose of sharing the same transmission channel of the data sharing relay station of the multiple terminals to the base station link. FIG. 1 is a schematic diagram of a protocol architecture established based on the principles of the embodiments of the present invention.

Based on the above design principle, the first embodiment of the present invention provides a communication system, as shown in FIG. 2, including: at least two packet data convergence protocol layer PDCP entities 11, a service convergence layer RRLC entity 12, and radio link control. a layer RLC entity 1 3; wherein the PDCP entity 11 is located at a packet data convergence protocol layer, the RRLC entity 12 is located at a service aggregation layer, and the RLC entity 13 is located at a radio link control layer, where the service convergence layer is located at the packet data convergence protocol layer And between the radio link control layer.

The PDCP entity 11 shown in FIG. 2 is configured to send a data packet from a higher layer to the RRLC entity 12, and the RRLC entity 12 is configured to aggregate the data packets sent by the at least two PDCP entities 11 and perform the aggregation operation. The data packet is sent to the RLC entity 1 3; the RLC entity 1 3 is used to perform a split/aggregate operation on the received data packet after the aggregation operation.

In order to be able to send the data packet to the receiving device, as shown in FIG. 3, the system of the first embodiment of the present invention may further include: a medium access control layer MAC entity 14 for multiplexing the data packet after the split/aggregation operation On the same transmission channel, it is transmitted to the receiving device via the L1 layer.

The above receiving device may be a base station or a relay station. That is to say, both the relay station side and the base station side may include a communication system as shown in Fig. 2 or Fig. 3.

As can be seen from the above, the communication system of the first embodiment of the present invention is passed through the newly added RRLC entity. After the aggregation operation, the data packets of the radio bearers of the at least two terminals are transmitted through a transmission channel, which overcomes the defect of wasting radio resources caused by transmitting the data packets of the radio bearer corresponding to one terminal through one transmission channel in the prior art. . Therefore, the embodiment of the present invention fully utilizes the transmission resources on the wireless link from the relay station to the base station, thereby optimizing the system performance of the relay network system.

Then, corresponding to the system shown in the first embodiment, the second embodiment of the present invention also provides a communication system, the composition of which is the same as that shown in FIG. 2 or FIG. The difference is that, in the second embodiment, the RLC entity 1 3 is configured to perform a split/aggregation operation on the received data packet, and send the processed data packet to the RRLC entity. The RRLC entity 12 is configured to use the RLC entity. The data packet sent by the packet is subjected to a de-aggregation operation, and the data packet after the de-aggregation operation is sent to the corresponding PDCP entity 1 1 ; the PDCP entity 1 1 is configured to receive the data packet sent by the RRLC entity 12. In order to enable the receiving device to accurately receive the data packet sent by the sending device, the medium access control layer MAC entity 14 is configured to demultiplex the data packet received by the L1 layer onto the logical channel, and process the processed data. The packet is sent to the RLC entity 13 .

Of course, in a specific application, the systems of the first embodiment and the second embodiment of the present invention can also be synthesized into one system, which requires each entity in the system to have the corresponding ones described in the first embodiment and the second embodiment. The function is to play different functions in different transmission directions.

The communication system of the second embodiment of the present invention overcomes the prior art by transmitting the data packets of the radio bearers of at least two terminals transmitted through one transport channel to the corresponding terminals by the de-aggregation operation by the newly added RRLC entity. A defect of wasting radio resources caused by transmitting a data packet of a radio bearer corresponding to one terminal through one transport channel. Therefore, the embodiment of the present invention fully utilizes the transmission resources on the wireless link from the relay station to the base station, thereby optimizing the system performance of the relay network system.

It can be seen from the above description that the embodiment of the present invention may include the communication in the two directions of the uplink communication and the downlink communication. The following Embodiment 3 and Embodiment 4 describe the processing manners of the relay station and the base station in the uplink communication direction as an example. The fifth embodiment and the sixth embodiment describe the processing manners of the relay station and the base station in the following communication directions as an example.

In order to improve the system performance of the relay network system, as shown in FIG. 4, Embodiment 3 of the present invention provides A method for improving the performance of a relay network system includes the following steps:

Step 41: The service aggregation layer on the relay station side The RRLC entity receives the data packet sent by at least two packet data convergence protocol layer PDCP entities. The data packets sent by the PDCP entity are data packets from radio bearers of at least two terminals.

Step 42: The RRLC entity on the relay station performs the aggregation operation on the data packet.

During the aggregation operation of the data packet by the RRLC entity, it can be implemented in at least two ways:

Manner 1: The RRLC entity includes an internal RLC entity and an aggregation entity. First, an internal RLC protocol data unit is generated by an internal RLC entity in the RRLC entity according to a PDCP protocol data unit of the data packet sent by the PDCP entity, and then an aggregation entity in the RRLC entity generates an RRLC according to the generated internal RLC protocol data unit. Protocol data unit.

The format of the internal RLC protocol data unit is the same as the format of the RLC PDU. Here, the technical solution of the embodiment of the present invention is accurately described, and the two are distinguished by name.

The structure and content of the RRLC PDU can be as shown in FIG. 5: RRLC header and RRLC load. The RRLC payload includes at least one internal RLC protocol data unit, and the RRLC header may include the following information:

A data/control flag bit (D/C) indicating whether the RRLC protocol data unit is a data protocol data unit or a control protocol data unit. A 1 indicates that the RRLC PDU is a data protocol data unit, and 0 indicates that the RRLC PDU is a control protocol data unit.

The aggregation flag bit (A) has a length of 1 bit, and is used to indicate that the protocol data unit is an RRLC protocol data unit or a PDCP protocol data unit, so that the base station or the relay station sends the received data packet to different protocol layers for processing. . A 1 indicates that the PDU is an RRLC protocol data unit, and 0 indicates that the PDU is a PDCP protocol data unit.

At least one reserved bit (R) for implementing function expansion, the default value is zero;

RRLC protocol data unit sequence number (SN), used for sequential transmission of RRLC protocol data units; extended flag bit (ΕΛ length is 1 bit, used to represent the i-th internal RLC protocol data Whether there is an internal RLC protocol data unit after the unit, i is an integer greater than or equal to 1. For example, 0 can be used to indicate that there is no more RLC PDU after RLC PDU # i, and 1 means that there will be RLC PDU after RLC PDU # i.

The cell radio network temporary identifier (C-RNTI J, which is used to uniquely identify the terminal in a cell, and has a length of 16 bits, indicating which terminal the RLC PDU # i in the RRLC load is from;

A logical channel identifier (LCIDJ, which is 5 bits in length), is used to uniquely identify a radio bearer in a terminal, and together with the radio network temporary identifier of the cell, determine information of a radio bearer to which the internal RLC protocol data unit belongs;

Length indication (Ll i ), used to indicate the length of the internal RLC protocol data unit;

Fill in the field, padding 0 in the padding field, so that the length of the RRLC header is whole bytes, which is convenient for machine processing.

Manner 2: The RRLC entity includes a convergence entity. The RRLC protocol data unit is generated by the aggregation entity in the RRLC entity according to the PDCP protocol data unit of the data packet sent by the PDCP entity.

As shown in Figure 6, the RRLC protocol data unit includes an RRLC header and an RRLC payload. The RRLC load includes at least one PDCP protocol data unit, and the RRLC header may include the following information: a data/control flag bit (D/C), indicating whether the RRLC protocol data unit is a data protocol data unit or a control protocol data unit. . A 1 indicates that the RRLC PDU is a data protocol data unit, and 0 indicates that the RRLC PDU is a control protocol data unit.

The aggregation flag bit (A) has a length of 1 bit, and is used to indicate that the protocol data unit is an RRLC protocol data unit or a PDCP protocol data unit, so that the base station or the relay station sends the received data packet to different protocol layers for processing. . For example, 1 can be used to indicate that the PDU is an RRLC protocol data unit, and 0 indicates that the PDU is a PDCP protocol data unit.

RRLC protocol data unit sequence number (SN), used for sequential transmission of RRLC protocol data units; extended flag bit (Ei), length 1 bit, used to indicate whether there is PDCP protocol data after the i-th PDCP protocol data unit Unit, i is an integer greater than or equal to 1. Can be represented by 0 in PDCP There is no longer a PDCP PDU after PDU#i, and a 1 indicates that there will be a PDCP PDU after PDCP PDU#i.

The cell radio network temporary identifier (C-RNTIJ) is used to uniquely identify the terminal in a cell, and has a length of 16 bits, indicating which terminal the PDCP PDU #i in the RRLC load is from;

a logical channel identifier (LCIDJ, which is 5 bits in length), is used to uniquely identify a radio bearer in a terminal, and together with the radio network temporary identifier of the cell, determine information of a radio bearer to which the PDCP protocol data unit belongs;

Length indication (Lli), used to indicate the length of the PDCP protocol data unit;

Of course, the RRLC entity may perform the aggregation operation on the received data packet by other means, and is not limited by the embodiment of the present invention.

Step 43: The RRLC entity sends the data packet after the aggregation operation to the radio link control layer RLC entity of the sending device, so that the data packet after the convergence operation passes through the radio link control layer, the medium access control layer, and the L1. The layer is transmitted to the receiving device.

In addition, in order to enable the base station to accurately receive the data packet of the terminal, as shown in FIG. 3, the method in the third embodiment of the present invention may further include:

Step 44: The RLC entity performs a split/aggregation operation on the received data packet after the aggregation operation, and sends the data packet to the media access control layer MAC entity.

Step 45: The MAC entity multiplexes the received data packets onto the same transport channel, and transmits the data to the receiving device through the L1 layer.

The processing and manner of the steps 44 and 45 are the same as those in the prior art, and are not described herein again.

It can be seen that, in the method of the third embodiment of the present invention, the data packet of the radio bearer of at least two terminals is transmitted through a transmission channel by using the newly added RRLC entity, and the prior art is overcome by one. The transmission channel transmits a packet of a radio bearer corresponding to a terminal, which causes a waste of radio resources. Therefore, the embodiment of the present invention fully utilizes the relay station to the base station The transmission resources on this wireless link optimize the system performance of the relay network system. Corresponding to the method of the third embodiment of the present invention, the fourth embodiment of the present invention further provides a method for improving the performance of a relay network system. This fourth embodiment mainly describes a processing method on the base station side corresponding to the three phases of the embodiment.

As shown in FIG. 8, the method for improving the performance of the relay network system in Embodiment 4 of the present invention includes: Step 51: The service aggregation layer RRLC entity on the base station side receives the data packet sent by the sending device, where the data packet is through the L1 layer. The media access control layer and the radio link control layer are transmitted to the service convergence layer.

In this embodiment, the sending device may refer to a relay station. When transmitting a data packet transmitted by the relay station via the L1 layer, the MAC layer, and the RLC layer, first, the L1 layer modulates and encodes the data packet transmitted by the transmitting device, transmits the data on the wireless link, and processes the processed data packet. Transmitting to the medium access control layer MAC entity, then the MAC entity demultiplexes the data packet onto the logical channel and sends it to the radio link control layer RLC entity, and finally the RLC entity removes the received RLC data protocol unit, and The processed data packet is sent to the RRLC entity.

Step 52: The RRLC entity on the base station side performs a deaggregation operation on the data packet.

Similarly, the RRLC entity can perform the deaggregation of the data packet in at least two ways.

Manner 1: The RRLC entity includes an internal RLC entity and an aggregation entity. First, the RRLC protocol data unit sent by the RLC entity of the radio link control layer is removed by the aggregation entity in the RRLC entity, and the processed data packet is sent to the internal RLC entity of the RRLC entity, and then internally by the RRLC entity. The RLC entity removes the internal RLC protocol data unit received by the aggregation entity to obtain a data packet to be sent to the packet data convergence protocol layer PDCP entity.

In this manner, the contents and format of the RRLC PDU are the same as those shown in FIG. 5 and corresponding to those in the third embodiment.

Manner 2: The RRLC entity includes a convergence entity. The aggregation entity in the RRLC entity removes the RRLC protocol data unit sent by the RLC entity of the radio link control layer, and obtains the data to be sent to the packet data sink. A packet of a protocol layer PDCP entity.

In this manner, the contents and format of the RRLC PDU are the same as those shown in FIG. 6 and corresponding to those in the third embodiment.

Step 53: The RRLC entity on the base station side sends the data packet of the deaggregation operation to the corresponding packet data convergence protocol layer PDCP entity.

According to the method of the fourth embodiment of the present invention, the data packet of the radio bearers of at least two terminals transmitted through one transport channel is respectively sent to the corresponding terminal by the de-aggregation operation by the newly added RRLC entity, thereby overcoming the present In the prior art, a defect of wasting radio resources caused by transmitting a data packet of a radio bearer corresponding to one terminal through one transmission channel. Therefore, the embodiment of the present invention fully utilizes the transmission resources on the wireless link from the relay station to the base station, thereby optimizing the system performance of the relay network system.

The processing procedures in the downlink direction, the base station side, and the relay station side will be separately described in Embodiment 5 and Embodiment 6. In the fifth embodiment, the processing manner on the base station side is the same as that described in the third embodiment, except that the execution body in each step in the third embodiment becomes the corresponding execution entity on the base station side; The processing manner on the relay station side is also the same as that described in the fourth embodiment, except that the execution body in each step in the fourth embodiment becomes the corresponding execution body on the relay station side. The specific process of implementation is detailed below.

Embodiment 5 of the present invention provides a method for improving performance of a relay network system, including the following steps:

Step 61: The service aggregation layer on the base station side The RRLC entity receives the data packet sent by at least two packet data convergence protocol layer PDCP entities. The data packets sent by the PDCP entity are data packets from radio bearers of at least two terminals.

Step 62: The RRLC entity on the base station side performs a convergence operation on the data packet.

The process of performing the aggregation operation by the RRLC entity is the same as that described in step 42. Step 63: The RRLC entity sends the data packet after the aggregation operation to the radio link control layer RLC entity of the sending device, so that the data packet after the convergence operation is connected to the radio link control layer and the media. The control layer and the L1 layer are transmitted to the receiving device.

In addition, in order to enable the relay station side to accurately receive the data packet of the terminal, the method of the fifth embodiment of the present invention may further include:

Step 64: The RLC entity performs a split/aggregation operation on the received data packet after the aggregation operation, and sends the data packet to the media access control layer MAC entity.

Step 65: The MAC entity multiplexes the received data packet into the same transport channel, and transmits the data packet to the receiving device through the L1 layer.

It can be seen that, in the method of the fifth embodiment of the present invention, the data packet of the radio bearer of at least two terminals is transmitted through a transmission channel by using the newly added RRLC entity, and the prior art is overcome by using one. The transmission channel transmits a packet of a radio bearer corresponding to a terminal, which causes a waste of radio resources. Therefore, the embodiment of the present invention fully utilizes the transmission resources on the wireless link from the relay station to the base station, thereby optimizing the system performance of the relay network system.

Corresponding to the fifth embodiment, the sixth embodiment of the present invention further provides a method for improving the performance of a relay network system, including the following steps:

Step 71: The service aggregation layer on the relay station side The RRLC entity receives the data packet sent by the sending device, where the data packet is transmitted to the service convergence layer via the L1 layer, the medium access control layer, and the radio link control layer.

Step 72: The RRLC entity on the relay station performs a deaggregation operation on the data packet.

The process of performing the deaggregation operation by the RRLC entity is the same as that described in step 52. Step 73: The RRLC entity on the relay station side sends the data packet of the deaggregation operation to the corresponding packet data convergence protocol layer PDCP entity.

According to the method of the sixth embodiment of the present invention, the data packet of the radio bearers of at least two terminals transmitted through one transport channel is respectively sent to the corresponding terminal by the de-aggregation operation by the newly added RRLC entity, thereby overcoming the present In the prior art, a defect of wasting radio resources caused by transmitting a data packet of a radio bearer corresponding to one terminal through one transmission channel. Therefore, the embodiment of the present invention fully utilizes the transmission resource on the wireless link from the relay station to the base station, thereby optimizing the relay network system. System performance.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. In execution, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), or a Random Accu s Memory (RAM).

As shown in FIG. 9, the seventh embodiment of the present invention further provides a protocol entity. Includes:

The receiving unit 81 is configured to receive a data packet sent by at least two packet data convergence protocol layer PDCP entities on the relay station/base station side;

The aggregation unit 82 is configured to perform a convergence operation on the data packet received by the receiving unit 81. The sending unit 83 is configured to send the data packet after the convergence operation received by the aggregation unit 82 to the relay station/base station side. The radio link control layer RLC entity is configured to transmit the data packet after the aggregation operation to the base station/relay station via the radio link control layer, the medium access control layer, and the L1 layer.

The aggregation unit 82 can complete the aggregation operation of the data packet in at least two manners. Therefore, the aggregation unit 82 may include: a first aggregation module, configured to generate an internal RLC protocol data unit according to a PDCP protocol data unit sent by a PDCP entity on the relay station/base station side; and a second aggregation module, configured to use, according to the first aggregation The internal RLC protocol data unit generated by the module generates an RRLC protocol data unit. Alternatively, the aggregation unit 82 may further include: a third aggregation module, configured to generate an RRLC protocol data unit according to the PDCP protocol data unit sent by the PDCP entity on the relay station/base station side.

Moreover, the protocol entity shown in FIG. 9 is located in the service aggregation layer of the relay station or the base station.

As can be seen from the above, in the protocol entity of the seventh embodiment of the present invention, the aggregation unit transmits the data packets of the radio bearers of at least two terminals through a transmission channel, which overcomes the transmission in the prior art through a transmission channel. A waste of wireless resources caused by a radio bearer packet corresponding to a terminal. Therefore, the seventh embodiment of the present invention makes full use of the transmission resources on the wireless link from the relay station to the base station, thereby optimizing the system performance of the relay network system.

As shown in FIG. 10, Embodiment 8 of the present invention further provides a protocol entity. include: The receiving unit 91 is configured to receive a data packet sent by the relay station/base station, where the data packet is transmitted by the L1 layer, the radio link control layer, and the medium access control layer of the base station/relay station side;

The de-aggregation unit 92 is configured to perform a de-aggregation operation on the data packet received by the receiving unit 91. The sending unit 93 is configured to send the de-aggregated operation data packet received by the de-aggregation unit 92 to the base station. / Packet data convergence protocol layer PDCP entity corresponding to the relay station side.

Corresponding to the seventh embodiment, the de-aggregation unit 92 can also perform the de-aggregation operation on the data packet in at least two ways. Therefore, the de-aggregation unit 92 includes: a first de-aggregation module, configured to remove the RRLC protocol data unit sent by the RLC entity of the radio link control layer on the base station/relay side, and send the processed data packet to the second The second aggregation module is configured to remove the internal RLC protocol data unit received by the first solution aggregation module, and obtain a data packet to be sent to the packet data convergence protocol layer PDCP entity of the base station/relay station side.

Alternatively, the de-aggregation unit 92 may further include: a third de-aggregation module, configured to remove the RRLC protocol data unit sent by the RLC entity of the radio link control layer on the base station/relay side, and obtain the information to be sent to the base station/relay station side Packet data aggregation protocol layer PDCP entity data packets.

Similarly, the protocol entity shown in Figure 10 can be located in the service aggregation layer of the relay station or base station.

As shown in the method of the sixth embodiment of the present invention, the de-aggregation unit transmits the data packets of the radio bearers of at least two terminals transmitted through one transport channel to the corresponding terminals by the de-aggregation operation, thereby overcoming the prior art. A waste of wireless resources caused by transmitting a data packet of a radio bearer corresponding to one terminal through one transport channel. Therefore, the eighth embodiment of the present invention makes full use of the transmission resources on the wireless link from the relay station to the base station, thereby optimizing the system performance of the relay network system.

Of course, in a specific application, the functions of the corresponding functional modules in the protocol entities shown in FIG. 9 and FIG. 10 can also be integrated into the same functional module. The protocol entities that integrate the functions of the corresponding functional modules of Fig. 9 and Fig. 10 can be located on the relay station side or the base station side, except that in different communication directions, each functional module performs its corresponding function.

In addition, the embodiments of the present invention can be mainly applied to technical fields such as a relay network. In summary, the method, the communication system, and the protocol entity for improving the performance of the relay network system are implemented by the newly added RRLC entity, and the data packets of the radio bearers of at least two terminals are transmitted through a transmission channel, or The data packets transmitted by one transmission channel are respectively transmitted to the corresponding terminals, which overcomes the defect of wasting radio resources caused by transmitting the data packets of the radio bearers corresponding to one terminal through one transmission channel in the prior art. Therefore, the embodiment of the present invention fully utilizes the transmission resources on the wireless link from the relay station to the base station, thereby optimizing the system performance of the relay network system.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

Claim

A method for improving the performance of a relay network system, comprising:

Service aggregation layer The RRLC entity receives a data packet sent by at least two packet data convergence protocol layer PDCP entities;

The RRLC entity performs a convergence operation on the data packet;

Transmitting the data packet after the aggregation operation to the radio link control layer RLC entity, so that the data packet after the convergence operation is transmitted to the receiving device through the radio link control layer, the medium access control layer, and the L1 layer. .

The method according to claim 1, wherein the RRLC entity includes an internal RLC entity and an aggregation entity; and the RRLC entity aggregates the data packet, including:

Generating, by the internal RLC entity, an internal RLC protocol data unit according to a PDCP protocol data unit sent by the PDCP entity;

The aggregation entity generates an RRLC protocol data unit according to the generated internal RLC protocol data unit.

The method according to claim 2, wherein the RRLC protocol data unit comprises: an RRLC header and an RRLC load;

The RRLC load includes at least one internal RLC protocol data unit;

The RRLC header includes the following information:

a data/control flag bit, configured to indicate whether the RRLC protocol data unit is a data protocol data unit or a control protocol data unit;

An aggregation flag bit, configured to indicate that the protocol data unit is an RRLC protocol data unit or a PDCP protocol data unit;

At least one reserved bit, used to implement function expansion, the default value is zero;

RRLC protocol data unit sequence number, used for sequential transmission of RRLC protocol data units; extended flag bit, used to indicate whether there is an internal RLC protocol data unit after the i-th internal RLC protocol data unit, i is an integer greater than or equal to 1. ; a temporary identifier of a cell radio network, configured to uniquely identify a terminal in a cell;

a logical channel identifier, configured to uniquely identify a radio bearer in a terminal, and determine, with the cell radio network temporary identifier, information about a radio bearer to which the internal RLC protocol data unit belongs; a length indication, used to indicate an internal RLC protocol data unit length;

Fill in the field, fill 0 in the padding field, so that the length of the RRLC header is the whole byte, which is convenient for machine processing.

The method according to claim 1, wherein the RRLC entity includes an aggregation entity; and the RRLC entity performs the aggregation operation on the data packet, including:

Data unit.

The method according to claim 4, wherein the RRLC protocol data unit includes an RRLC header and an RRLC load;

The RRLC load includes at least one PDCP protocol data unit;

The RRLC header includes at least the following information:

RRLC protocol data unit sequence number, used for sequential transmission of RRLC protocol data units; extended flag bit, used to indicate whether there is a PDCP protocol data unit after the i-th PDCP protocol data unit, and i is an integer greater than or equal to 1;

a temporary identifier of a cell radio network, configured to uniquely identify a terminal in a cell;

a logical channel identifier, configured to uniquely identify a radio bearer in a terminal, and together with the cell radio network temporary identifier, determine information about a radio bearer to which the PDCP protocol data unit belongs;

Length indication, used to indicate the length of the PDCP protocol data unit; The padding field is filled with 0 in the padding field, so that the length of the RRLC packet header is a whole byte, which is convenient for machine processing.

The method according to any one of claims 1 to 5, wherein the transmitting the data packet after the aggregation operation to the receiving device via the radio link control layer, the medium access control layer, and the L1 layer comprises: The RLC entity performs a split/aggregation operation on the received data packet after the aggregation operation, and then sends the data packet to the media access control layer MAC entity;

The MAC entity multiplexes the received data packets onto the same transport channel and transmits the same to the receiving device through the L1 layer.

7. The method according to claim 6, wherein the receiving device comprises a base station or a relay station.

8. A method for improving performance of a relay network system, comprising:

The service aggregation layer receives the data packet sent by the sending device, where the data packet is transmitted to the service convergence layer via the L1 layer, the medium access control layer, and the radio link control layer;

The RRLC entity performs a deaggregation operation on the data packet;

The data packet of the de-aggregation operation is sent to a corresponding packet data convergence protocol layer PDCP entity.

The method according to claim 8, wherein the RRLC entity includes an internal RLC entity and an aggregation entity; and the RRLC entity performs a deaggregation operation on the data packet, including:

The aggregation entity removes the RRLC protocol data unit sent by the RLC entity of the radio link control layer, and sends the processed data packet to the internal RLC entity of the RRLC entity;

The internal RLC entity removes the internal RLC protocol data unit received by the aggregation entity to obtain a data packet to be sent to the packet data convergence protocol layer PDCP entity.

The method according to claim 8, wherein the RRLC entity includes an aggregation entity, and the RRLC entity performs a deaggregation operation on the data packet, including:

The aggregation entity removes the RRLC protocol data unit sent by the RLC entity of the radio link control layer, and obtains a data packet to be sent to the packet data convergence protocol layer PDCP entity.

The method according to any one of claims 8 to 10, wherein before the step of the service aggregation layer RRLC entity receiving the data packet sent by the sending device, the method further includes:

The L1 layer processes the data packet sent by the sending device, and sends the processed data packet to the media access control layer MAC entity;

The MAC entity demultiplexes the data packet onto a logical channel and sends the data packet to the radio link control layer RLC entity;

The RLC entity removes the received RLC data protocol unit and sends the processed data packet to the RRLC entity.

12. The method according to claim 11, wherein the transmitting device comprises a relay station or a base station.

1 3. A protocol entity, characterized in that:

a convergence unit, configured to perform a convergence operation on the data packet received by the receiving unit, and a sending unit, configured to send, by the aggregation unit, the data packet after the aggregation operation to the wireless link of the relay station/base station side The control layer RLC entity is configured to transmit the data packet after the aggregation operation to the base station/relay station via a radio link control layer, a medium access control layer, and an L1 layer.

The protocol entity according to claim 13, wherein the aggregation unit comprises: a first aggregation module, configured to generate an internal RLC according to a PDCP protocol data unit sent by a PDCP entity on the relay station/base station side Protocol data unit;

And a second aggregation module, configured to generate an RRLC protocol data unit according to the internal RLC protocol data unit generated by the first aggregation module.

The protocol entity according to claim 13, wherein the aggregation unit comprises: a third aggregation module, configured to generate an RRLC protocol according to a PDCP protocol data unit sent by a PDCP entity on the relay station/base station side Data unit.

16. The protocol entity according to any one of claims 1 to 3, wherein the protocol is The body is located at a service convergence layer of the relay station or base station.

17. A protocol entity, characterized by comprising:

a receiving unit, configured to receive a data packet sent by the relay station/base station, where the data packet is transmitted through the L1 layer of the base station/relay station side, the radio link control layer, and the medium access control layer;

a de-aggregation unit, configured to perform a de-aggregation operation on the data packet received by the receiving unit, and a sending unit, configured to send the data packet after the de-aggregation operation received by the de-aggregation unit to the base station/relay station side Corresponding packet data convergence protocol layer PDCP entity.

The protocol entity according to claim 17, wherein the de-aggregation unit comprises: a first de-aggregation module, configured to remove the RLC entity sent by the radio link control layer on the base station/relay side An RRLC protocol data unit, and the processed data packet is sent to the second de-aggregation module; the second de-aggregation module is configured to remove the internal RLC protocol data unit received by the first de-aggregation module, and obtain the information to be sent to Packet data of the packet data convergence protocol layer PDCP entity on the base station/relay side.

The protocol entity according to claim 17, wherein the de-aggregation unit comprises: a third de-aggregation module, configured to remove the RLC entity sent by the radio link control layer on the base station/relay side The RRLC protocol data unit obtains a data packet to be sent to the packet data convergence protocol layer PDCP entity on the base station/relay side.

The protocol entity according to any one of claims 1-7, wherein the protocol entity is located at a service convergence layer of the relay station or the base station.

A communication system, comprising: at least two packet data convergence protocol layer PDCP entities, a service convergence layer RRLC entity, and a radio link control layer RLC entity; wherein the PDCP entity is located at a packet data convergence protocol layer The RRLC entity is located at a service aggregation layer, the RLC entity is located at a radio link control layer, and the service aggregation layer is located between the packet data convergence protocol layer and the radio link control layer;

The PDCP entity, configured to send a data packet from a high layer to the RRLC entity;

The RRLC entity is configured to perform a convergence operation on the data packets sent by the at least two PDCP entities. And sending, by the aggregation operation, the data packet to the RLC entity;

The RLC entity is configured to perform a split/aggregate operation on the received data packet after the aggregation operation.

The system according to claim 21, further comprising:

The media access control layer MAC entity is configured to multiplex the data packet after the split/aggregation operation onto the same transport channel, and transmit the data packet to the receiving device via the L1 layer.

The RLC entity is configured to perform a split/aggregation operation on the received data packet, and send the processed data packet to the RRLC entity;

The RRLC entity is configured to perform a deaggregation operation on the data packet sent by the RLC entity, and send the data packet after the de-aggregation operation to the corresponding PDCP entity;

The PDCP entity is configured to receive a data packet sent by the RRLC entity.

24. The system of claim 23, further comprising:

The medium access control layer MAC entity is configured to demultiplex the data packet received by the L1 layer onto the logical channel, and send the processed data packet to the RLC entity.