CN109348485B - Multi-user uplink and downlink burst discontinuous low-rate service transmission method - Google Patents
Multi-user uplink and downlink burst discontinuous low-rate service transmission method Download PDFInfo
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- CN109348485B CN109348485B CN201811197461.7A CN201811197461A CN109348485B CN 109348485 B CN109348485 B CN 109348485B CN 201811197461 A CN201811197461 A CN 201811197461A CN 109348485 B CN109348485 B CN 109348485B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
Abstract
The invention relates to a multi-user uplink and downlink burst discontinuous low-rate service transmission method, belongs to the technical field of wireless mobile communication, and solves the problem of extra overhead caused by complex signaling in a switching process when burst discontinuous low-rate service transmission is carried out in the prior art. The method comprises the following steps: C-ERAB is established through an S1 port, and a PDCP-x protocol entity is introduced to an EPC side; judging whether the current service to be transmitted is a multi-user burst discontinuous low-rate service or not, wherein the data of the multi-user burst discontinuous low-rate service is transmitted through C-ERAB; the EPC side processes the multi-user burst discontinuous low-rate service through the PDCP-x protocol entity and the eNB side through the PDCP protocol entity. By the method, the processing flow of the packet data is simplified, the time delay and the expense of control signaling are reduced, and the user experience of 'no switching' is realized; meanwhile, the method has good compatibility, can be completely compatible with the existing 4G system, and can also adapt to the scene requirements of B4G/5G.
Description
Technical Field
The invention relates to the technical field of wireless mobile communication, in particular to a multi-user uplink and downlink burst discontinuous low-rate service transmission method.
Background
With the popularization of the mobile internet, various internet services need to be connected with an internet server through a wireless mobile network, and particularly after the broadband wireless mobile network of B4G or even 5G is popularized, the wireless mobile network must support more internet services.
The internet service system has the common characteristics that data transmission is discontinuous (time intervals are calculated in seconds and are compared with 1ms air interface transmission time intervals of LTE (Long Term Evolution)), the service rate is low, and burst data packets can be large or small, but once data is transmitted, the data needs to be transmitted in time so as to avoid influencing the experience perception of users.
In the 4G, B4G, and 5G systems based on TD-LTE (Time Division Long Term Evolution), when a user switches, it is necessary to perform configuration for the S1 port and forward Packet Data Convergence Protocol (PDCP)/Radio Link Control (RLC) Data. However, for the burst discontinuous low-rate service, at the time of switching, the probability that the user needs to forward data is very low, and if the existing complete switching mode is still used, the switching time delay is increased by the preposition of a large amount of control signaling and state information and the deletion of the flow, a large amount of useless work is done, and the system efficiency is reduced.
Disclosure of Invention
In view of the foregoing analysis, the present invention aims to provide a method for transmitting a multi-user uplink/downlink burst discontinuous low-rate service, so as to solve the problem of additional overhead caused by complex signaling in a handover process when a discontinuous low-rate service is transmitted in the prior art.
The purpose of the invention is mainly realized by the following technical scheme:
a method for transmitting multi-user uplink and downlink burst discontinuous low-rate service is provided, which comprises the following steps:
C-ERAB is established through an S1 port, and a PDCP-x protocol entity is introduced to an EPC side;
judging whether the current service to be transmitted is a multi-user burst discontinuous low-rate service or not, wherein data of the multi-user burst discontinuous low-rate service is transmitted through C-ERAB;
the EPC side processes the multi-user burst discontinuous low-rate service through the PDCP-x protocol entity and the eNB side through the PDCP protocol entity.
The invention has the following beneficial effects: the method simplifies the processing flow of the packet data and reduces the time delay and the expense of controlling signaling; from the perspective of time delay and bearing, the user experience of 'no switching' is realized; meanwhile, the method has good compatibility, can be completely compatible with the existing 4G system, and can also adapt to the scene requirements of B4G/5G.
On the basis of the scheme, the invention is further improved as follows:
further, the PDCP-x protocol is used to perform some or all of the PDCP protocol functions.
Further, the EPC side processes the multi-user burst discontinuous low rate service through the PDCP-x protocol entity, including:
finishing the mapping from the IP Data packet to the Data Flow;
the context information of the user is managed,
sending the IP data packets according to a first-in first-out receiving sequence;
generating PDCP PDU without SN number and sending to PDCP protocol entity at eNB side;
further, the eNB side processes the multi-user burst discontinuous low rate service through the PDCP protocol entity, including:
the eNB side establishes different RBs for different services of a user;
and the PDCP protocol entity at the eNB side generates a protocol data packet header of the PDCP PDU containing the SN number.
Further, the context information includes: a user identification ID of a user at an S1 port, an identification ID of a service at the S1 port, a unified identification of the user in an EPC and a cell identification of a RAN where the user is located;
further, the EPC side processes the multi-user burst non-continuous low-rate service through the PDCP-x protocol entity, including:
finishing the mapping from the IP Data packet to the Data Flow;
the user context information is simplified and managed,
and performing header compression/header decompression, encryption/decryption, ordered data transmission and reception, and transmitting the processed data to the eNB side.
Further, the eNB side processes the multi-user burst discontinuous low rate service through the PDCP protocol entity, including:
the eNB side establishes different RBs for different services of a user;
and the PDCP at the eNB side transparently transmits the received data transmitted by the EPC side.
Further, the simplified user context information includes the user identification ID of the user at the S1 port, the ID of the service RB, encryption and decryption parameters, a header compression algorithm, an SN number, and the DiscardTimer of the data.
Further, when the link is switched, the EPC side receives the S1 interface context information sent by the target cell, and completes the "connectionless" switching to the target cell.
Further, the processed multi-user burst discontinuous low-rate service is an uplink and downlink multi-user burst discontinuous low-rate service.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
Fig. 1 is a flow chart of a multi-user uplink and downlink burst discontinuous low-rate service transmission method in an embodiment of the present invention;
fig. 2 is a schematic diagram of introducing a PDCP-x protocol and a PDCP protocol into the transmission method in the embodiment of the present invention.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
For burst non-continuous low-rate services, when the user has only this kind of services and there is no other continuous high-rate services, the complex signaling overhead in the handover process is unnecessary because the probability that there is data to be forwarded on the whole link of the user at the time of handover is almost 0 due to the "non-continuous" characteristic, and the timeliness of a large amount of configured channel parameters and context information is also low.
If the S1 port realizes Common Enhanced radio Access Bearer (Common Enhanced Access Bearer), based on the C-ERAB, part of functions of PDCP processing burst discontinuous low-rate service are moved to EPC, and the part of functions mainly finish mapping control of user service and RB and control of user context, thus realizing 'no connection' switching.
Aiming at the problems existing in the prior art for processing the burst discontinuous low-rate service and the C-ERAB scheme, a specific embodiment of the invention discloses a method for transmitting the multi-user uplink and downlink burst discontinuous low-rate service, which comprises the following steps as shown in figure 1:
s1, establishing C-ERAB through an S1 port, and introducing a PDCP-x protocol entity at the EPC side;
s2, judging whether the current service to be transmitted is a multi-user burst discontinuous low-rate service or not, wherein data of the multi-user burst discontinuous low-rate service is transmitted through C-ERAB;
and step S3, the EPC side processes the multi-user burst discontinuous low-rate service through the PDCP-x protocol entity and the eNB side through the PDCP protocol entity.
Compared with the prior art, the uplink and downlink burst discontinuous low-rate service transmission method provided by the embodiment. The processing flow of the packet data is simplified, the time delay and the expense of controlling signaling are reduced, and the user experience of 'no switching' is realized from the aspects of time delay and bearing; meanwhile, the method has good compatibility, can be completely compatible with the existing 4G system, and can also adapt to the scene requirements of B4G/5G.
It should be noted that, in this embodiment, based on a C-ERAB (Common-Enhanced Radio Access Bearer) scheme of the S1 port, a part/all of PDCP functions for processing the uplink and downlink burst discontinuous low-rate services are moved up to the EPC to form a PDCP-x protocol entity, so as to implement management of user context information on the EPC side, and it is not necessary to put all the context information on the eNB side as in the existing scheme, so as to simplify handover of the S1 port, and avoid the need of performing complex handover processing when a user performs link handover, thereby implementing "connectionless" handover. Wherein, the "connectionless" handover means: aiming at the users of the burst discontinuous low-rate service, strong links do not need to be established in each cell, when the users move, the service can be carried out as long as basic context configuration is completed, and the time delay and the complexity of switching are reduced.
Specifically, in step S1, a C-ERAB is established through an S1 port, and is used for carrying transmission of data resources corresponding to the burst discontinuous low rate service on the EPC side and the eNB side;
in addition, for the characteristics of discontinuous transmission of burst discontinuous low-rate service data and low service rate, different from the existing processing of user context information by a PDCP protocol entity at the eNB side, the embodiment introduces a PDCP-x protocol entity at the EPC side so as to process the user context information of the service at the EPC side, thereby greatly reducing the processing pressure of the PDCP protocol entity at the eNB side, and reducing the time delay and the overhead of control signaling.
In order to implement the conversion and processing from the IP packet to the data flow at the EPC side, the signaling configuration flow and parameters need to be modified accordingly.
In step S2, whether the current service to be transmitted is a multi-user burst discontinuous low-rate service is judged; in particular, the amount of the solvent to be used,
when the service characteristic parameter configured for the user service by the core network is an internet interaction parameter, determining that the user service is a multi-user burst low-rate burst service; further, when the number of bytes of the data IP packet of the user service is smaller than a preset value, such as 1500 bytes, and the transmission interval between two adjacent data IP packets is greater than a preset time, such as 10ms, it is determined that the bursty low-rate service is bursty discontinuous low-rate service.
When the RB (Radio Bearer) judges that the service needing to be transmitted is a multi-user burst discontinuous low-rate service, the service is transmitted by adopting the C-ERAB and is processed by the step S3; when the service needing to be transmitted is judged to be other services, the C-ERAB bearer or the special ERAB bearer can be selected for transmission according to the service transmission requirement.
In step S3, the EPC side and the eNB side cooperate with each other through the PDCP-x protocol entity to exclusively process the service transmitted over the C-ERAB (i.e., the multi-user burst discontinuous low rate service).
As shown in fig. 2, the eNB still configures a PDCP protocol entity, where the PDCP protocol specifically includes the following functions: compressing and decompressing packet headers of user plane data; encrypting and decrypting a user protocol and a control plane protocol, and protecting and verifying the integrity of control plane data; data transmission function: (1) when the lower layer is reconstructed, the PDU transmitted to the upper layer is sequentially transmitted and reordered; (2) reordering lower layer SDUs of RBs mapped to AM mode; packet drops, etc. The EPC side completes all or part of functions of the PDCP protocol through the PDCP-x protocol entity added in the step S1 and is matched with the PDCP protocol entity at the eNB side to realize the transmission processing of the multi-user burst discontinuous low-rate service.
It should be emphasized that, in the embodiment of the present invention, the EPC-side PDCP-x protocol entity and the eNB-side PDCP protocol entity may cooperate to process the service transmitted on the C-ERAB in two ways:
in the first mode, the RB on the eNB side still establishes one RB for each service in a manner of several RBs per user. In order to ensure the correct execution of various functions of header compression/header decompression, ciphering/deciphering, ARQ retransmission, and orderly transmission and reception of data of the PDCP and RLC, the eNB side still needs to establish different RBs for different services of the user, and the EPC side completes part of PDCP protocol functions.
In particular, the amount of the solvent to be used,
1. the protocol of the PDCP-x at the EPC side finishes the mapping from the IP Data packet to the Data Flow;
2. the protocol of the EPC side PDCP-x maintains simple context information of the user, comprising the following steps: a user identifier ID of a user at an S1 port, an identifier ID of a service at the S1 port, a unified identifier of the user in an EPC, a cell identifier of a RAN (Radio Access Network) where the user is located, and the like.
3. The protocol of the PDCP-x at the EPC side ensures that the IP data packets are sent according to the first-in first-out receiving sequence and forms PDCP PDUs without SN numbers; the PDCP protocol at the eNB side is responsible for generating protocol data packet headers of PDCP PDUs such as SN. It should be noted that the above processing of the protocol of the EPC side PDCP-x is to reduce the processing pressure of the eNB side PDCP protocol entity.
4. The EPC side does not store the PDCP SDU and still gives the PDCP SDU to the eNB side for processing.
And the second mode is to move all functions of the PDCP protocol processing of the eNB side to the PDCP-x protocol entity processing of the EPC side. The PDCP protocol at the eNB side only carries out transparent transmission of service data and does not carry out any processing.
In particular, the amount of the solvent to be used,
1. the PDCP-x protocol entity at the EPC side finishes the mapping from the IP Data packet to the Data Flow;
2. the PDCP-x protocol entity at the EPC side simplifies the user context information which needs to be maintained by the original complete PDCP protocol, and the simplified user context information only needs to comprise the user identification ID of the user at the S1 port, the ID of the service RB, encryption and decryption parameters, a header compression algorithm, an SN number, the DiscardTimer of data and other core parameters.
3. The EPC side PDCP-x protocol entity completes all functions when the eNB side PDCP protocol entity processes the type of RB, which is equivalent to that all PDCP protocol functions for processing burst discontinuous low-rate service are moved up to the EPC side, and the PDCP of the eNB side does not perform any processing on the type of RB, and only data is transmitted.
In addition, when a link handover is required (which may occur between cells or within a cell), the PDCP-x protocol entity on the EPC side receives the S1 interface context information sent from the target cell, and the "connectionless" handover to the target cell can be completed by either of the above two manners.
Specifically, when performing cell handover, the EPC-x PDCP entity receives S1 interface context information sent by the source cell, including: the identification information of the terminal equipment requesting for switching, the switching request message of the identification information of the target cell to be switched and the configuration request message of the C-ERAB which is sent by the target cell corresponding to the identification information of the target cell and contains the identification information of the terminal equipment requesting for switching. According to the configuration request message of the S1 interface CERAB, the source cell selects an available RB from a radio bearer RB resource pool, and when receiving a data resource needing to be switched and sent by a terminal device corresponding to the identification information of the terminal device requesting to be switched, the available RB is used for sending the data resource bearer to the target cell, so that the uniqueness of the mapping relation between the identification information of the terminal device determined by the EPC and the available RB is utilized, and when the terminal device needs to realize the switching of the data resource from the source cell to the target cell, the RB used for transmitting the data resource with the target cell is allocated to the terminal device requesting to be switched according to the configuration request message initiated by the target cell.
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by hardware associated with computer program instructions, and the program may be stored in a computer readable storage medium. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (7)
1. A multi-user uplink and downlink burst discontinuous low-rate service transmission method is characterized by comprising the following steps:
C-ERAB is established through an S1 port, and a PDCP-x protocol entity is introduced to an EPC side; the PDCP-x protocol entity is used for completing the functions of part or all of the PDCP protocol;
when the current service to be transmitted is judged to be a multi-user burst discontinuous low-rate service, transmitting data of the multi-user burst discontinuous low-rate service through C-ERAB;
the EPC side processes the multi-user burst discontinuous low-rate service through the PDCP-x protocol entity and the eNB side through the PDCP protocol entity;
the EPC end processes the multi-user burst discontinuous low-rate service through the PDCP-x protocol entity, and comprises the following steps:
finishing the mapping from the IP Data packet to the Data Flow;
managing context information of a user;
sending the IP data packets according to a first-in first-out receiving sequence;
generating PDCP PDU without SN number and sending to PDCP protocol entity at eNB side, wherein the EPC side does not store PDCP SDU;
the eNB side processes the multi-user burst discontinuous low-rate service through the PDCP protocol entity, and the processing comprises the following steps:
the eNB side establishes different RBs for different services of a user;
a PDCP protocol entity at the eNB side generates a protocol data packet header of a PDCP PDU containing an SN number;
the following steps are adopted to judge whether the current service to be transmitted is a multi-user burst discontinuous low-rate service:
when the service characteristic parameter configured for the user service by the core network is an internet interaction parameter, determining that the user service is a multi-user burst low-rate burst service; and when the byte number of the data IP packet of the user service is smaller than a preset value and the sending interval of two adjacent data IP packets is longer than a preset time, determining that the multi-user burst low-rate burst service is a burst discontinuous low-rate service.
2. The method of claim 1,
the context information includes: the method comprises the steps of identifying a user ID of a user at an S1 port, identifying an ID of a service at the S1 port, identifying a user in an EPC uniformly, and identifying a cell of a RAN where the user is located.
3. The method of claim 1, wherein the EPC side processes multi-user burst non-continuous low rate service through PDCP-x protocol entity, comprising:
finishing the mapping from the IP Data packet to the Data Flow;
the user context information is simplified and managed,
and performing header compression/header decompression, encryption/decryption, ordered data transmission and reception processing, and transmitting the processed data to the eNB side.
4. The method of claim 3, wherein the eNB side processes the multiuser burst non-continuous low rate service through the PDCP protocol entity, comprising:
the eNB side establishes different RBs for different services of a user;
and the PDCP at the eNB side carries out transparent transmission on the received data sent by the EPC side.
5. The method of claim 4, wherein the simplified context information of the subscriber comprises a subscriber identity ID of the subscriber on the S1 port, an ID of the service RB, encryption/decryption parameters, a header compression algorithm, an SN number, and a DiscardTimer of the data.
6. The method according to claim 2 or 5, characterized in that, in the link handover, the EPC side receives the context information of the S1 interface sent by the target cell, and completes the "connectionless" handover to the target cell.
7. The method according to claim 6, wherein the processed multiuser burst non-continuous low-rate service is an uplink and downlink multiuser burst non-continuous low-rate service.
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