CN101500289A - Downlink data packet forwarding method, system and evolution base station - Google Patents
Downlink data packet forwarding method, system and evolution base station Download PDFInfo
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Abstract
The invention relates to a downlink data packet transmitting method, a system and an evolution base station. In the embodiment of the downlink data packet transmitting method, a downlink data packet comprises a data packet transmitted by a source evolution base station eNodeB, and among the data packets transmitted by the source eNodeB, the data packet processed by the source eNodeB by a packet data convergence protocol (PDCP) is set as the data packet of first class, comprising the following steps: the source eNodeB sets the PDCP SN in the message head of the data packet of first class; and the source eNodeB transmits the data packet of first class to a target eNodeB. By setting the PDCP SN in the message head of the data packet, the embodiment of the invention leads the data packet message to carry the PDCP SN when being switched between the eNodeBs (namely the switching on an X2 interface) without using the mode of expanding the head, thus reducing the processing load of network nodes and eNodeB nodes in an LTE network, and enhancing the processing capacity and performance of the whole network.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to retransmission method, system and the evolution base station of downlink data packet.
Background technology
Universal mobile telecommunications system (Universal Mobile Telecommunication System is called for short UMTS) is a kind of third generation cordless communication network technical standard of 3GPP tissue definition.The UMTS network is made up of core net and Access Network, and core net comprises circuit domain and packet domain, and circuit domain provides based on Circuit-switched business (for example speech business), and packet domain provides the business based on packet switching (for example Internet visit).The terminal that the mobile subscriber uses is UE (User Equipment).
Fig. 1 is the structural representation of existing UMTS network, core net (Core Network, be called for short CS) by packet switching (Packet Switch, be called for short PS) territory and circuit switching (Circuit Switch, be called for short CS) the territory composition, the PS territory is by Serving GPRS Support Node (Serving GPRS Support Node, be called for short SGSN), Gateway GPRS Support Node (Gateway GPRS Support Node, be called for short GGSN) and attaching position register (Home Location Register, be called for short HLR) form, core network domain is by MSC, VLR, GMSC equipment is formed, Access Network is made up of radio network controller (Radio NetworkController is called for short RNC) and NodeB.Each RNC connects some NodeB, and each SGSN connects some RNC.Communicate by the Uu interface between UE and the NodeB, communicate by the Iu interface between Access Network and the core net, core net is connected with External Network.
In the superincumbent UMTS network, the over-the-air protocol stack is at RNC, guarantee the lossless migration of packet, the packet of confirming without UE of buffer memory and do not have enough time to carry out PDCP (Packet Data Convergence Protocol in must transfer source RNC, abbreviation PDCP) packet of handling is to Target RNC, among the RNC of source in the packet of confirming without UE of buffer memory owing to passed through PDCP and handle therefore and have corresponding PDCP SN, the packet of not handling through PDCP among the RNC of source does not have corresponding PDCP SN.Because UE is according to the orderly reception packet of PDCP SN, therefore, PDCP SN in the packet that Target RNC need forward according to the source RNC of its reception does not carry out PDCP SN numbering to remaining packet of handling through PDCP, with guarantee the PDCP layer can and UE between realize data sync.
Long Term Evolution (Long Term Evolution, be called for short LTE) flat wireless access network (the Radio Access Network of system's employing, be called for short RAN) structure, cancelled radio network controller (RadioNetwork Control, be called for short RNC), the purpose of LTE provides a kind of network cheaply that can reduce time delay, raising user data rate, improved power system capacity and covering, uses PS territory business, and bearer network all is the IP carrying.
Fig. 2 is the structural representation of existing LTE Radio Access Network, and the LTE wireless access network comprises that evolved NodeB (evolved-NodeB is to call eNodeB in the following text) and evolved bag core (Evolved PackerCore is called for short EPC) constitute.ENodeB adopts grid (mesh) mode to interconnect by X2 interface by the main network element evolution of NodeB, the RNC in R6 stage between the eNodeB.Interface between eNodeB and the EPC is called the S1 interface.EPC comprises mobile chain of command entity (Mobility Management Entity is called for short MME) and user entity (SAE GateWay is called for short SGW).MME is responsible for the mobile management of chain of command as the chain of command part, comprises the management of user's context and mobile status, distributing user temporary identity sign etc.; SGW is responsible for initiating paging for downlink data under the idle condition as user's face portion, and IP bearing parameter and the interior routing iinformation of network etc. are preserved in management.Between MME and the SGW is netted the connection, and promptly a MME can control several SGW well.The S1 interface is supported the EPC and the eNodeB annexation of multi-to-multi.At LET structure shown in Figure 2, usually the repertoire of the RNC in the existing network is transferred to eNodeB, make eNodeB have whole Radio interface protocols stacks.The evolution architecture user face protocol stack of this kind two node layers comprises UE user face protocol stack, eNodeB user face protocol stack and SGW user face protocol stack as shown in Figure 3.Communicate by the Uu interface between UE and the eNodeB, communicate by the S1 interface between eNodeB and the SGW.
The SGW user face protocol stack comprises: GPRS Tunnel Protocol user face (being called for short GTP-U) layer, User Datagram Protoco (UDP)/Internet protocol (UDP/IP) layer, L2 layer and L1 layer.
ENodeB User Agreement stack comprises: Radio interface protocols stack and S1 protocol stack of the interface.The Radio interface protocols stack comprises: PDCP (being called for short PDCP) layer, radio link control (being called for short RLC) layer, medium access control (being called for short MAC) layer, L1 layer; The S1 protocol stack of the interface comprises: GTP-U layer, UDP/IP layer, L2 layer and L1 layer.
The UE user face protocol stack comprises: PDCP layer, rlc layer, MAC layer and L1 layer.
Above-described L2 layer is meant the layer 2 in the layered protocol, i.e. data link layer is as frame relay, ATM or wireless data link layer etc.; Above-described L1 is meant the layer 1 in the layered protocol, i.e. physical layer is as physical layers such as E1, optical fiber, microwave transmissions.
User face protocol stack above adopting, the over-the-air protocol stack is all at eNodeB, guarantee the lossless migration of packet, the packet of confirming without UE of buffer memory and not having enough time carries out packet that PDCP handles to target eNode B in must transfer source eNodeB, among the eNodeB of source in the packet of confirming without UE of buffer memory owing to passed through PDCP and handle therefore and have corresponding PDCP SN, the packet of not handling through PDCP among the eNodeB of source does not have corresponding PDCP SN.Because UE is according to the orderly reception packet of PDCP SN, therefore, PDCP SN in the packet that target eNode B need forward according to the source eNodeB of its reception does not carry out PDCP SN numbering to remaining packet of handling through PDCP, with guarantee the PDCP layer can and UE between realize data sync.
In the prior art, no matter be to transmit the corresponding PDCP SN of packet in the wireless UMTS network between the RNC, when still transmitting packet correspondence PDCP SN in the LTE network between the eNodeB, by in packet, carrying the PDCP SN of this packet correspondence in the mode of extended head.This method can increase the processing load of network node, causes the decline of overall network performance.
Summary of the invention
A first aspect of the present invention provides a kind of downlink data packet forwarding method, with the processing load of eNodeB node in the LTE network, improves the disposal ability and the performance of overall network.
A second aspect of the present invention is that a kind of evolution base station is being provided, and to alleviate the processing load of eNodeB node in the LTE network, improves the disposal ability and the performance of overall network.
A third aspect of the present invention is that a kind of evolution base station is being provided, and to alleviate the processing load of eNodeB node in the LTE network, improves the disposal ability and the performance of overall network.
A fourth aspect of the present invention is that a kind of downlink data packet forwarding system is being provided, and to alleviate the processing load of eNodeB node in the LTE network, improves the disposal ability and the performance of overall network.
For realizing above-mentioned first aspect, embodiments of the invention provide a kind of downlink data packet forwarding method, described downlink data packet comprises the packet that source evolution base station eNodeB transmits, if in the packet that source eNodeB transmits, the packet that carries out PDCP PDCP processing through source eNodeB is the primary sources bag, comprising: source eNodeB is arranged on PDCP SN in the message header of primary sources bag; Source eNodeB is to target eNode B converting downlink packet.
For realizing above-mentioned second aspect, embodiments of the invention provide a kind of evolution base station, and when this base station during as source eNodeB, comprising: processing module is arranged on PDCP SN in the message header of the primary sources bag of handling through PDCP; Sending module is connected with described processing module, is used for transmitting packet to target eNode B, and described packet comprises the primary sources bag of handling through described processing module.
For realizing the above-mentioned third aspect, embodiments of the invention provide another kind of evolution base station, when this base station during as target eNode B, comprising: receiver module, be used to receive packet, described packet comprises the primary sources bag through the PDCP processing that source eNodeB transmits; Generation module is connected with described receiver module, is used to construct the PDCP packet of described primary sources bag correspondence, and the PDCP SN that carries in the message header of described primary sources bag is added on the sequence-number field of corresponding PDCP packet.
For realizing above-mentioned fourth aspect, embodiments of the invention provide a kind of downlink data packet forwarding system, comprise source eNodeB and target eNode B, wherein, described source eNodeB comprises: processing module is arranged on PDCPSN in the message header of the primary sources bag of handling through PDCP; Sending module is connected with described processing module, is used for transmitting packet to target eNode B, and described packet comprises the primary sources bag of handling through described processing module; Described source eNodeB comprises: receiver module, be used to receive packet, and described packet comprises the primary sources bag; Generation module is connected with described receiver module, is used to construct the PDCP packet of described primary sources bag correspondence, and the PDCP SN that carries in the message header of described primary sources bag is added on the sequence-number field of corresponding PDCP packet.
The above embodiment of the present invention, by PDCP SN is set in the data packet message head, make and carry PDCP SN, the data sync after having guaranteed to switch when the mode that does not need in this data packet message to re-use extended head just can be switched (being the switching on the X2 interface) between eNodeB; In addition, owing to directly in the data packet message head, carry PDCP SN, thus alleviated the processing load of network node with eNodeB node in the LTE network, improve the disposal ability and the performance of overall network.
Description of drawings
Fig. 1 is the structural representation of existing UMTS network;
Fig. 2 is the structural representation of existing LTE Radio Access Network;
Fig. 3 is the user face protocol stack schematic diagram of prior art LTE Radio Access Network;
Fig. 4 is the flow chart of downlink data packet forwarding method embodiment one of the present invention;
Fig. 5 is the flow chart of downlink data packet forwarding method embodiment two of the present invention;
Fig. 6 is the structural representation of a kind of evolution base station of the present invention;
Fig. 7 is the structural representation of the another kind of evolution base station of the present invention;
Fig. 8 is the structural representation of downlink data packet forwarding system of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
The downlink data packet that target eNode B receives comprises the packet of source eNodeB forwarding and the packet that target SGW issues.The packet that source eNodeB transmits comprises packet of handling through PDCP and the packet of not handling through PDCP.In the packet that source eNodeB transmits, the packet of handling through PDCP has PDCP SN.The packet of handling through PDCP does not have PDCP SN.If the packet of handling through PDCP among the eNodeB of source is the primary sources bag.
Fig. 4 is the flow chart of downlink data packet forwarding method embodiment one provided by the invention.This method comprises:
The primary sources bag of source eNodeB, might before switching, all send to user terminal, when switching beginning, only received the response of some primary sources bag that user terminal sends, for the primary sources bag of receiving response, the expression user terminal is received, therefore in order to save the forwarding resource, these first packets are not transmitted, but transmitted the primary sources bag of not receiving that user terminal is responded.
Fig. 5 is the flow chart of downlink data packet forwarding method embodiment two provided by the invention.In this method in described step 2 source eNodeB after target eNode B is transmitted packet primary sources bag and secondary sources bag, comprise further:
Step 4, target eNode B parse the PDCP SN that carries in the message header of described primary sources bag;
The packet that source eNodeB transmits comprises also that not carrying out the packet that PDCP handles through source eNodeB is the secondary sources bag, and the 3rd class packet that issues by target SGW, secondary sources bag and the 3rd class packet are not handled through PDCP, therefore do not have PDCP SN.The Base Serial Number that carries in the X2AP message that target eNode B can be transmitted according to source eNodeB carries out PDCP SN numbering to the 3rd class packet and the 3rd class packet that receives.
Among the embodiment of downlink data packet forwarding method of the present invention, PDCP SN is by length, and promptly shared bit number can be divided into the first kind and second type, and the length of the PDCP SN of the first kind is less than or equal to 8bit; The length of the PDCP SN of second type is greater than 8bit and smaller or equal to 16bit.The first kind in following examples is example with 7bit, and second type is that 12bit is an example.
Among the embodiment of downlink data packet forwarding method of the present invention, source eNodeB is arranged on PDCP SN in the message header of primary sources bag, can be divided into following two kinds of situations by the position is set:
(1) PDCP SN is arranged on GTP SN field in the message header of primary sources bag;
(2) PDCP SN is arranged on extended field in the message header of primary sources bag.
(11) for (1) kind situation, the 9th in message header of primary sources bag and cross joint are GTP SN field, the type that does not need to indicate PDCP SN.If the default type of PDCP SN is 7bit, instantiation is as follows:
The PDCP sequence number is multiplexing in the Sequence of GTP packet Number field (GTP SN field), does not need to indicate the type of PDCP sequence number, and the default type of PDCP SN is 7bit.The GTP message header of this scheme correspondence is as shown in table 1 below:
Table 1,
[notes]: 1: version wherein: version number;
S bit: if be, represent that this GTP message header comprises PDCP SN at 1 o'clock, multiplexing in the field 9 and/or 10 have a PDCP SN; If be, represent that this GTP message header does not comprise PDCP SN at 0 o'clock;
2:Message Type represents type of message;
3,4:Length represents message-length;
5,6,7,8: the expression Tunnel Identifier;
9, the sequence number of 10:GTP.
When Message Type indicated this GTP message and is signaling message, the 9 10th byte was Sequence Number, was used for association request message and its corresponding response message.S bit is nonsensical.
When Message Type indicates this GTP message and is user data, if S bit is 0, shows and do not carry the PDCP sequence number in this data-message do not have multiplexing PDCP SN in the 9th byte and the 10th byte.
When Message Type indicates this GTP message and is user data,, show and carried the PDCP sequence number in this data-message if S bit is 1.PDCP SN is 7bits, and PDCP SN is carried at the 9th byte, does not take the 10th byte, 7 bits correspondences in the 9th byte PDCP SN.
When source eNodeB will carry out data forwarding, for the packet of having handled through the PDCP layer, according to the type of its PDCP layer data, the S bit in the GTP packet that it is corresponding, PDCP SN field is according to above-mentioned regular set.Purpose eNodeB receives the GTP packet, when the corresponding PDCP packet of structure with GTP packet head in the content of PDCP SN field copy out, fill on the sequence-number field of PDCP packet.
(12) for (1) kind situation, the 9th in message header of primary sources bag and cross joint are GTP SN field, the type that does not need to indicate PDCP SN.If the default type of PDCP SN is 12bit, instantiation is as follows:
The PDCP sequence number is multiplexing in the Sequence of GTP packet Number field (GTP SN field), does not need to indicate the type of PDCP sequence number.If the default type of PDCP SN is 12bit, instantiation is as follows:
The GTP message header of this scheme correspondence is as shown in table 2 below:
Table 2,
When Message Type indicated this GTP message and is signaling message, the 9 10th byte was Sequence Number, was used for association request message and its corresponding response message.S bit is nonsensical.
When Message Type indicates this GTP message and is user data, if S bit is 0, shows and do not carry the PDCP sequence number in this data-message that the 9th byte and the 10th byte do not have multiplexing PDCP SN.
When Message Type indicates this GTP message and is user data,, show and carried the PDCP sequence number in this data-message if S bit is 1.PDCP SN is 12bits, and PDCP SN is carried at the 9th byte and the 10th byte, 12 bits correspondences in the 9th byte and the 10th byte PDCP SN.
Further, for (1) kind situation, if also need be provided for indicating the information of PDCP SN type at the message header of primary sources bag.
(13) for above-mentioned (1) kind situation, in message header of primary sources bag the 9th and cross joint are GTP SN field, adopt the GTP SN field of the first data packet message head to carry PDCP SN if preestablish, then the eNodeB GTP SN field that PDCP SN is arranged in the message header of primary sources bag in source is specially: the type of judging PDCP SN, when described PDCP SN is the first kind, source eNodeB is provided with indication PDCP SN type in the message header of primary sources bag be the information of the first kind, and PDCP SN is arranged on the 9th byte in the message header of primary sources bag; When described PDCP SN was second type, source eNodeB is provided with indication PDCPSN type in the message header of primary sources bag be the information of second type, and PDCP SN is arranged on the 9th and the cross joint in the message header of primary sources bag.
Instantiation is as follows:
The PDCP sequence number is multiplexing in the Sequence of GTP packet Number field (GTP SN field), needs the type of indication PDCP sequence number, and sign is arranged on GTP data packet message head.
The GTP message header of this scheme correspondence is as shown in table 3 below:
Table 3,
[notes]: P bit: the type of indication PDCP SN, when being 1 (or 0), P bit represents that PDCP is the 7bit type, when being 0 (or 1), P bit represents that PDCP is the 12bit type.
When Message Type indicated this GTP message and is signaling message, the 9 10th byte was Sequence Number, was used for association request message and its corresponding response message.S bit and P bit are nonsensical.
When Message Type indicates this GTP message and is user data, if S bit is 0, shows and do not carry the PDCP sequence number in this data-message that do not have the 9 10th byte, P bit is nonsensical.
When Message Type indicates this GTP message and is user data,, show and carried the PDCP sequence number in this data-message if S bit is 1.Expression PDCP is 7bits if P bit is 1 (perhaps being 0), and at this moment PDSP SN is carried at the 9th byte, does not take the 10th byte, 7 bits correspondences in the 9th byte PDCP SN.
When Message Type indicates this GTP message and is user data,, show and carried the PDCP sequence number in this data-message if S bit is 1.Expression PDCP is 12bits if P bit is 0 (perhaps being 1), at this moment has PDCP SN to be carried at the 9th byte and the 10th byte, 12 bits correspondences wherein PDCP SN.
When source eNodeB will carry out the packet forwarding, for the packet of having handled through the PDCP layer, according to the type of its PDCP layer data, the S bit in the GTP packet that it is corresponding, P bit and PDCP SN field are according to above-mentioned regular set.Purpose eNodeB receives the GTP packet, when the corresponding PDCP packet of structure with GTP packet head in the content of PDCP SN field copy out, fill on the sequence-number field of PDCP packet.
(14) for above-mentioned (1) kind situation, in message header of primary sources bag the 9th and cross joint are GTP SN field, adopt the GTP SN field of the first data packet message head to carry PDCP SN if preestablish, then the eNodeB GTP SN field that PDCP SN is arranged in the message header of primary sources bag in source is specially: the type of judging PDCP SN, when described PDCP SN is the first kind, source eNodeB is provided with indication PDCP SN type at source eNodeB in the X2AP message that target eNode B sends be the information of the first kind, and PDCP SN is arranged on the 9th byte in the message header of primary sources bag; When described PDCP SN is second type, source eNodeB is provided with indication PDCP SN type at source eNodeB in the X2AP message that target eNode B sends be the information of second type, and PDCP SN is arranged on the 9th and the cross joint in the message header of primary sources bag.
Concrete enforcement is as follows:
The PDCP sequence number is multiplexing in the Sequence of GTP packet Number field, needs the type of indication PDCP sequence number, and sign is arranged on source eNodeB in the X2AP message that target eNode B sends.
The GTP message header of this scheme correspondence is as shown in table 4 below:
Table 4,
When Message Type indicated this GTP message and is signaling message, the 9 10th byte was Sequence Number, was used for association request message and its corresponding response message.S bit is nonsensical.
When Message Type indicates this GTP message and is user data, if S bit is 0, shows and do not carry the PDCP sequence number in this data-message do not have the 9 10th byte.
When Message Type indicates this GTP message and is user data,, show and carried the PDCP sequence number in this data-message if S bit is 1.The information of indication PDCP SN type can be arranged on corresponding source eNodeB in the X2AP message that target eNode B sends.A bit that is exclusively used in indication PDCP SN type can be set in the X2AP message,, an information of being diverted to indication PDCP SN type can be set also as P bit.Among this embodiment, be provided with a P bit who is exclusively used in indication PDCP SN type in the X2AP message, if PDCP SN is 7bits, it is 0 (perhaps being 1) that P bit is set, at this moment PDCP SN is carried at the 9th byte, does not take the 10th byte, 7 bits correspondences in the 9th byte PDCP SN.
When Message Type indicates this GTP message and is user data,, show and carried the PDCP sequence number in this data-message if S bit is 1.If PDCP is 12bits, it is 1 (perhaps being 0) that the P bit in the X2AP of correspondence message is provided with P bit, and at this moment PDCP SN is carried at the 9th byte and the 10th byte, 12 bits correspondences in the 9th byte and the 10th byte PDCP SN.
When source eNodeB will carry out data forwarding, for the packet of having handled through the PDCP layer, according to the type of its PDCP layer data, the S bit in the GTP packet that it is corresponding, the P bit among PDCP SN field and the X2AP is according to above-mentioned regular set.Purpose eNodeB receives GTP packet and corresponding X2AP message, when the corresponding PDCP packet of structure with GTP packet head in the content of PDCP SN field copy out, fill on the sequence-number field of PDCP packet.
(21) for (2) kind situation, the 11 and the 12 byte in the message header of primary sources bag is an extended field, and the PDCP sequence number is arranged in the extended field, does not need to indicate the type of PDCP SN.If the default type of PDCP SN is 7bit, instantiation is as follows:
The GTP message header of this scheme correspondence is as shown in table 5 below:
Table 5,
When Message Type indicates this GTP message and is signaling message, there is not the 11st byte.Sbit is nonsensical.
When Message Type indicates this GTP message and is user data, if S bit is 0, shows and do not carry the PDCP sequence number in this data-message do not have the 11st byte.
When Message Type indicates this GTP message and is user data,, show and carried the PDCP sequence number in this data-message if S bit is 1.PDCP SN is 7bits, and PDCP SN is carried at the 11st byte, 7 bits correspondences in the 11st byte PDCP SN.
(22) for (2) kind situation, the 11 and the 12 byte in the message header of primary sources bag is an extended field, and the PDCP sequence number is arranged in the extended field, does not need to indicate the type of PDCP SN.If the default type of PDCP SN is 12bit, instantiation is as follows:
The GTP message header of this scheme correspondence is as shown in table 6 below:
Table 6,
When Message Type indicates this GTP message and is signaling message, there is not the 11 12nd byte.S bit is nonsensical.
When Message Type indicates this GTP message and is user data, if S bit is 0, shows and do not carry the PDCP sequence number in this data-message do not have the 11 12nd byte.
When Message Type indicates this GTP message and is user data,, show and carried the PDCP sequence number in this data-message if S bit is 1.PDCP is 12bits, and PDCP SN is carried at the 11st byte and the 12nd byte, the 12bits correspondence in the 11st byte and the 12nd byte PDCP SN.
When source eNodeB will carry out data forwarding, for the packet of having handled through the PDCP layer, according to the type of its PDCP layer data, the S bit in the GTP packet that it is corresponding, PDCP SN field is according to above-mentioned regular set.Purpose eNodeB receives the GTP packet, when the corresponding PDCP packet of structure with GTP packet head in the content of PDCP SN field copy out, fill on the sequence-number field of PDCP packet.
Further, for (2) kind situation, if also need be provided for indicating the information of PDCP SN type at the message header of primary sources bag.
(23) for above-mentioned (2) kind situation, the the 11 and the 12 byte in the message header of primary sources bag is an extended field, adopt the extended field of the first data packet message head to carry PDCP SN if preestablish, then the eNodeB extended field that PDCP SN is arranged in the message header of primary sources bag in source is specially: the type of judging PDCP SN, when described PDCP SN is the first kind, source eNodeB is provided with indication PDCP SN type in the message header of primary sources bag be the information of the first kind, and PDCP SN is arranged on the 11 byte in the message header of primary sources bag; When described PDCP SN was second type, source eNodeB is provided with indication PDCP SN type in the message header of primary sources bag be the information of second type, and PDCP SN is arranged on the 11 and the 12 byte in the message header of primary sources bag.
Concrete enforcement is as follows:
The PDCP sequence number is arranged in the extended field, needs the type of indication PDCP sequence number, and sign is arranged in the GTP message header.
The GTP message header of this scheme correspondence is as shown in table 7 below:
Table 7,
When Message Type indicates this GTP message and is signaling message, there is not the 11st byte the 12nd byte.S bit and P bit are nonsensical.
When Message Type indicates this GTP message and is user data, if S bit is 0, shows and do not carry the PDCP sequence number in this data-message that do not have the 11st byte the 12nd byte, P bit is nonsensical.
When Message Type indicates this GTP message and is user data,, show and carried the PDCP sequence number in this data-message if S bit is 1.Expression PDCP is 7bits if P bit is 1 (perhaps being 0), at this moment has the 11st byte not have the 12nd byte, 7 bits correspondences in the 1st byte PDCP SN.
When Message Type indicates this GTP message and is user data,, show and carried the PDCP sequence number in this data-message if S bit is 1.Expression PDCP is 12bits if P bit is 0 (perhaps being 1), and at this moment PDCP SN is carried at the 11st byte and the 12nd byte, the 12bits correspondence in the 11st byte and the 12nd byte PDCP SN.
When source eNodeB will carry out data forwarding, for the packet of having handled through the PDCP layer, according to the type of its PDCP layer data, the S bit in the GTP packet that it is corresponding, P bit and PDCP SN field are according to above-mentioned regular set.Purpose eNodeB receives the GTP packet, when the corresponding PDCP packet of structure with GTP packet head in the content of PDCP SN field copy out, fill on the sequence-number field of PDCP packet.
(24) for above-mentioned (2) kind situation, the the 11 and the 12 byte in the message header of primary sources bag is an extended field, adopt the extended field of the first data packet message head to carry PDCP SN if preestablish, then the eNodeB extended field that PDCP SN is arranged in the message header of primary sources bag in source is specially: the type of judging PDCP SN, when described PDCP SN is the first kind, source eNodeB is provided with indication PDCP SN type at source eNodeB in the X2AP message that target eNode B sends be the information of the first kind, and PDCP SN is arranged on the 11 byte in the message header of primary sources bag; When described PDCP SN is second type, source eNodeB is provided with indication PDCP SN type at source eNodeB in the X2AP message that target eNode B sends be the information of second type, and PDCP SN is arranged on the 11 and the 12 byte in the message header of primary sources bag.
Instantiation is as follows:
The PDCP sequence number is arranged in the extended field, needs the type of indication PDCP sequence number, and sign is arranged in the X2AP message.
The GTP message header of this scheme correspondence is as shown in table 8 below:
Table 8
When Message Type indicates this GTP message and is signaling message, there is not the 11st byte the 12nd byte.S bit is nonsensical.
When Message Type indicates this GTP message and is user data, if S bit is 0, shows and do not carry the PDCP sequence number in this data-message do not have the 11 12nd byte.
When Message Type indicates this GTP message and is user data,, show and carried the PDCP sequence number in this data-message if S bit is 1.The information of indication PDCP SN type can be arranged in the corresponding X2AP message.A bit that is exclusively used in indication PDCP SN type can be set in the X2AP message,, an information of being diverted to indication PDCP SN type can be set also as P bit.Among this embodiment, be provided with a P bit who is exclusively used in indication PDCP SN type in the X2AP message, if PDCP is 7bits, it is 0 (perhaps being 1) that P bit is set, at this moment PDCP SN is carried in the 11st byte, does not have the 12nd byte, 7 bits correspondences in the 11st byte PDCP SN.
When Message Type indicates this GTP message and is user data,, show and carried the PDCP sequence number in this data-message if S bit is 1.If PDCP is 12bits, it is 1 (perhaps being 0) that the P bit in the X2AP of correspondence message is provided with P bit, and at this moment PDCP SN is carried at the 11st byte and the 12nd byte, 12 bits correspondences in the 11st byte and the 12nd byte PDCP SN.
When source eNodeB will carry out data forwarding, for the packet of having handled through the PDCP layer, according to the type of its PDCP layer data, the S bit in the GTP packet that it is corresponding, the Pbit among PDCP SN field and the X2AP is according to above-mentioned regular set.Purpose eNodeB receives GTP packet and corresponding X2AP message, when the corresponding PDCP packet of structure with GTP packet head in the content of PDCP SN field copy out, fill on the sequence-number field of PDCP packet.
Embodiments of the invention also provide a kind of evolution base station, and when this base station during as source eNodeB, as shown in Figure 6, comprising: processing module 101 is arranged on PDCP SN in the message header of the primary sources bag of handling through PDCP; Sending module 102 is connected with processing module 101, is used for transmitting packet to target eNode B, and described packet comprises the primary sources bag of handling through processing module 101.
Embodiments of the invention also provide a kind of evolution base station, when this base station during as target eNode B, as shown in Figure 7, comprising: receiver module 201 is used to receive packet, the primary sources bag of handling through PDCP that described packet comprises that source eNodeB transmits; Generation module 202 is connected with receiver module 201, is used to construct the PDCP packet of described primary sources bag correspondence, and the PDCP SN that carries in the message header of described primary sources bag is added on the sequence-number field of corresponding PDCP packet.
Embodiments of the invention also provide a kind of downlink data packet forwarding system, as shown in Figure 8, comprise source eNodeB100 and target eNode B 200, source eNodeB100 comprises: processing module 101 is arranged on PDCPSN in the message header of the primary sources bag of handling through PDCP; Sending module 102 is connected with processing module 101, is used for transmitting packet to target eNode B, and described packet comprises the primary sources bag of handling through described processing module 101.Source eNodeB200 comprises: receiver module 201, be used to receive packet, and described packet comprises the primary sources bag; Generation module 202 is connected with receiver module 201, is used to construct the PDCP packet of described primary sources bag correspondence, and the PDCP SN that carries in the message header of described primary sources bag is added on the sequence-number field of corresponding PDCP packet.
The embodiment of above downlink data packet forwarding method, system and evolution base station, by PDCP SN is set in the data packet message head, make and carry PDCP SN, the data sync after having guaranteed to switch when the mode that does not need in this data packet message to re-use extended head just can be switched (being the switching on the X2 interface) between eNodeB; In addition, owing to directly in the data packet message head, carry PDCP SN, thus alleviated the processing load of network node with eNodeB node in the LTE network, improve the disposal ability and the performance of overall network.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (11)
1, a kind of downlink data packet forwarding method, described downlink data packet comprises the packet that source evolution base station eNodeB transmits, if in the packet that source eNodeB transmits, the packet that carries out PDCP PDCP processing through source eNodeB is the primary sources bag, it is characterized in that this method comprises:
Source eNodeB is arranged on PDCP SN in the message header of primary sources bag;
Source eNodeB transmits packet to target eNode B.
2, method according to claim 1 is characterized in that, also comprises:
Target eNode B is constructed the PDCP packet of described primary sources bag correspondence;
Target eNode B is added the PDCP SN that carries in the message header of described primary sources bag on the sequence-number field of corresponding PDCP packet to.
3, method according to claim 1 is characterized in that, described source eNodeB is arranged on PDCP SN in the message header of primary sources bag and is specially:
Source eNodeB is arranged on PDCP SN the GTP SN field in the message header of primary sources bag.
4, method according to claim 3, it is characterized in that, the message header of described primary sources bag or source eNodeB also comprise the information that is used to indicate PDCP SN type in the X2AP message that target eNode B sends, described PDCP SN type comprises the first kind that is less than or equal to eight bits, and greater than eight bits and be less than or equal to second type of 16 bits.
5, method according to claim 4, it is characterized in that, in message header of primary sources bag the 9th and cross joint are GTP SN field, adopt the GTP SN field of the first data packet message head to carry PDCP SN if preestablish, then the eNodeB GTP SN field that PDCP SN is arranged in the message header of primary sources bag in source is specially: the type of judging PDCP SN, when described PDCP SN is the first kind, source eNodeB is provided with indication PDCP SN type at the message header of primary sources bag or source eNodeB in the X2AP message that target eNode B sends be the information of the first kind, and PDCP SN is arranged on the 9th byte in the message header of primary sources bag; When described PDCP SN is second type, source eNodeB is provided with indication PDCP SN type at the message header of primary sources bag or source eNodeB in the X2AP message that target eNode B sends be the information of second type, and PDCP SN is arranged on the 9th and the cross joint in the message header of primary sources bag.
6, method according to claim 1 is characterized in that, described source eNodeB is arranged on PDCP SN in the message header of primary sources bag and is specially:
Source eNodeB is arranged on PDCP SN the extended field in the message header of primary sources bag.
7, method according to claim 6, it is characterized in that, the message header of described primary sources bag or source eNodeB also comprise the information that is used to indicate PDCP SN type in the X2AP message that target eNode B sends, described PDCP SN type comprises the first kind that is less than or equal to eight bits, and greater than eight bits and be less than or equal to second type of 16 bits.
8, method according to claim 7, it is characterized in that, the the 11 and the 12 byte in the message header of primary sources bag is an extended field, adopt the extended field of the first data packet message head to carry PDCP SN if preestablish, then the eNodeB extended field that PDCP SN is arranged in the message header of primary sources bag in source is specially: the type of judging PDCP SN, when described PDCP SN is the first kind, source eNodeB is provided with indication PDCP SN type at the message header of primary sources bag or source eNodeB in the X2AP message that target c NodeB sends be the information of the first kind, and PDCP SN is arranged on the 11 byte in the message header of primary sources bag; When described PDCP SN is second type, source eNodeB is provided with indication PDCP SN type at the message header of primary sources bag or source eNodeB in the X2AP message that target eNode B sends be the information of second type, and PDCP SN is arranged on the 11 and the 12 byte in the message header of primary sources bag.
9, a kind of evolution base station when this base station during as source eNodeB, is characterized in that, comprising:
Processing module is arranged on PDCP SN in the message header of the primary sources bag of handling through PDCP;
Sending module is connected with described processing module, is used for transmitting packet to target eNode B, and described packet comprises the primary sources bag of handling through described processing module.
10, a kind of evolution base station when this base station during as target eNode B, is characterized in that, comprising:
Receiver module is used to receive packet, and described packet comprises the primary sources bag through the PDCP processing that source eNodeB transmits; Generation module is connected with described receiver module, is used to construct the PDCP packet of described primary sources bag correspondence, and the PDCP SN that carries in the message header of described primary sources bag is added on the sequence-number field of corresponding PDCP packet.
11, a kind of downlink data packet forwarding system comprises source eNodeB and target eNode B, it is characterized in that,
Described source eNodeB comprises: processing module is arranged on PDCP SN in the message header of the primary sources bag of handling through PDCP; Sending module is connected with described processing module, is used for transmitting packet to target eNode B, and described packet comprises the primary sources bag of handling through described processing module; Described source eNodeB comprises: receiver module, be used to receive packet, and described packet comprises the primary sources bag; Generation module is connected with described receiver module, is used to construct the PDCP packet of described primary sources bag correspondence, and the PDCP SN that carries in the message header of described primary sources bag is added on the sequence-number field of corresponding PDCP packet.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010142082A1 (en) * | 2009-06-12 | 2010-12-16 | 华为技术有限公司 | Switching process method, relay node and target node |
| WO2010145238A1 (en) * | 2009-11-02 | 2010-12-23 | 中兴通讯股份有限公司 | Method, transmitter, receiver and system for data back-transmission |
| WO2012058984A1 (en) * | 2010-11-01 | 2012-05-10 | 中兴通讯股份有限公司 | Method and device for base station interaction |
| CN102869056A (en) * | 2012-09-14 | 2013-01-09 | 中国联合网络通信集团有限公司 | Transmission switching method and system under base station straight-through architecture |
| CN103533586A (en) * | 2012-07-03 | 2014-01-22 | 电信科学技术研究院 | Method and apparatus for signaling interaction and layer reconstruction in switching process |
| WO2014019240A1 (en) * | 2012-08-03 | 2014-02-06 | 华为技术有限公司 | Data processing method, base station and ue |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010142082A1 (en) * | 2009-06-12 | 2010-12-16 | 华为技术有限公司 | Switching process method, relay node and target node |
| WO2010145238A1 (en) * | 2009-11-02 | 2010-12-23 | 中兴通讯股份有限公司 | Method, transmitter, receiver and system for data back-transmission |
| WO2012058984A1 (en) * | 2010-11-01 | 2012-05-10 | 中兴通讯股份有限公司 | Method and device for base station interaction |
| CN103533586A (en) * | 2012-07-03 | 2014-01-22 | 电信科学技术研究院 | Method and apparatus for signaling interaction and layer reconstruction in switching process |
| WO2014019240A1 (en) * | 2012-08-03 | 2014-02-06 | 华为技术有限公司 | Data processing method, base station and ue |
| CN102869056A (en) * | 2012-09-14 | 2013-01-09 | 中国联合网络通信集团有限公司 | Transmission switching method and system under base station straight-through architecture |
| CN102869056B (en) * | 2012-09-14 | 2016-05-18 | 中国联合网络通信集团有限公司 | Transmission changing method and system under the straight-through framework in base station |
| CN112789839A (en) * | 2019-06-25 | 2021-05-11 | Oppo广东移动通信有限公司 | Data packet processing method, device and storage medium |
| CN112789839B (en) * | 2019-06-25 | 2023-01-24 | Oppo广东移动通信有限公司 | Data packet processing method, device and storage medium |
| WO2023184479A1 (en) * | 2022-04-01 | 2023-10-05 | Lenovo (Beijing) Limited | Method and apparatus of supporting mobility |
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