CN101742430A

CN101742430A - Data packet processing method, device and base station

Info

Publication number: CN101742430A
Application number: CN200810217489A
Authority: CN
Inventors: 黄曲芳; 余成文
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2008-11-20
Filing date: 2008-11-20
Publication date: 2010-06-16

Abstract

The embodiment of the invention discloses a method for processing a data packet in a single cell mode, which comprises the following steps: receiving a plurality of data packets; sorting the plurality of data packets; and determining a mode of transmitting the data packets to user equipment UE according to the continuity of the sorted data packets. The invention also provides a corresponding device and a base station. The scheme provided by the embodiment of the invention solves the out-of-order problem during receiving the data packets.

Description

Data package processing method, device and base station

Technical field

The present invention relates to the communications field, relate in particular to a kind of data packet sending method, device and base station.

Background technology

3GPP is divided into two big classes with the downlink communication business: unicast service (Unicast) and multimedia broadcast-multicast service (MBMS), wherein unicast service is meant the data point to point service, PTP that a data source sends to a user terminal (UE), and MBMS is meant the data point-to-multipoint service that a data source sends to a plurality of UE.In evolvement network (LTE) MBMS can with sending mode have two kinds:

Many cell patterns (MC-PTM): MBMS Traffic Channel MTCH is mapped on the Multicast Channel (MCH), point-to-multipoint transmission in a plurality of sub-districts, each sub-district is at the identical identical packet of time transmission, and UE can receive the wireless signal of a plurality of sub-districts, and does the signal merging.

Single cell pattern (SC-PTM): MBMS Traffic Channel (MTCH) is mapped on the descending synchronous signal channel (DL-SCH), point-to-multipoint transmission in single sub-district.

At present, when adopting SC-PTM in the MBMS business, how packet transmits does not also have concrete scheme.

Summary of the invention

The embodiment of the invention provides data package processing method, device and base station in a kind of single cell pattern.

The processing method of packet comprises in a kind of single cell pattern that the embodiment of the invention provides: receive a plurality of packets; Described a plurality of packets are sorted; Determine to send the mode of packet to user terminal UE according to the continuity of the packet after the ordering.

The embodiment of the invention provides a kind of device of handle packet, and this device is arranged in the network side of single cell pattern, comprising: receiving element is used to receive a plurality of packets; Sequencing unit is used for a plurality of packets that described receiving element receives are sorted; Transmitting element, the result after being used for sorting according to described sequencing unit determines to send to UE the mode of packet, and sends packet.

The embodiment of the invention also provides a kind of base station, and this base station comprises the aforesaid device that is arranged in the handle packet of single cell pattern network side.

The embodiment of the invention provides the method for single cell pattern conveying type handle packet in a kind of MBMS business, by the packet that receives is sorted, and determine to send the mode of packet according to the continuity of packet, the processing mode of packet in concrete single cell pattern is provided.

Description of drawings

Fig. 1 is the schematic network structure of embodiment of the invention application scenarios;

Fig. 2 is the schematic flow sheet of PDCP layered data processing bag in the existing method;

Fig. 3 is the schematic flow sheet of PDCP layered data processing bag in the prior art;

Fig. 4 is that a kind of data that the embodiment of the invention provides are protected the schematic flow sheet of handling;

Fig. 5 is that the another kind of data that the embodiment of the invention provides are protected the schematic flow sheet of handling;

Fig. 6 is the apparatus structure schematic diagram of a kind of handle packet of providing of the embodiment of the invention.

Embodiment

For the purpose that makes the embodiment of the invention, technical scheme, and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the embodiment of the invention is further described.

Existing Paket Data Convergence Protocol (Packet Data Convergence Protocol, PDCP) flow process designs at unicast service, PDCP layer and Radio Link control (RadioLink Control in the unicast service, RLC) layer all is positioned at evolution base station (Evolved NodeB, ENB) in the entity, therefore data packet disorder can not take place, in the packet process of transmitting, PDCP is a counting of each allocation of packets (COUNT) value, be used to identify the bag sequence number of PDCP, the COUNT separated into two parts: the high-order Hyper Frame Number (HFN) and the PDCP sequence of data packet of low level number (PDCP SN is called for short SN), wherein, the SN of low level is as the part of PDCP header structure, be included in the packet, high-order HFN then is not included in the data packet head, but is preserved by packet transmitting terminal and receiving terminal.Transmitting terminal uses COUNT value and other parameters of packet correspondence, and this packet is carried out encrypt/decrypt, and computings such as integrity protection in packet header, are with the pairing SN of this packet at last, pass to receiving terminal.After the PDCP layer of receiving terminal is received packet, from data packet head, solve HFN value that SN and self preserve together, be combined into one 32 COUNT value, the packet of receiving is decrypted, separates operations such as a compression.In order to ensure the correctness to data packet encryption/deciphering, the HFN that transmitting terminal and receiving terminal are preserved must be consistent.Particularly, the PDCP handling process of receiving terminal as shown in Figure 3 in the unicast service, when PDCP receives a packet, the SN of the next packet that the SN of the packet of the more current reception in capital and expectation receive, if the SN of the packet of current reception is less than the SN of the next packet of expectation reception, HFN is added 1, and be combined into the COUNT value according to new HFN and SN the packet of current reception is decrypted, if the SN of the packet of current reception is greater than the SN of the next packet of expectation reception, HFN does not add 1, and directly uses this HFN and SN to be combined into the COUNT value packet of current reception is decrypted.

Be illustrated in figure 1 as the schematic network structure of embodiment of the invention application scenarios, MBMS GW links to each other by the M1 interface with ENB, and data may produce out of order phenomenon when sending by the M1 interface.PDCP layer and rlc layer lay respectively in MBMS GW and the ENB entity in the MBMS business, if the PDCP flow process of unicast service in the prior art is directly used in the professional SC-PTM transmission mode of MBMS, when M1 interface generation data packet disorder, because ENB need not to send in strict accordance with official hour stamp information, if promptly receive out of order packet, ENB also directly sends according to the order of the packet that receives, then can cause between MBMS GW and the UE HFN asynchronous, particularly, describe with as shown in Figure 2 example, after the PDCP entity of UE is received No. 3 packets, expectation receives that next PDCP packet sequence number (Next-PDCP-RX-SN) equals 4, but the actual packet of receiving No. 1, be that SN equals 1, because the packet Next-PDCP-RX-SN that SN receives less than next one expectation is so according to flow process shown in Figure 3, UE can add 1 with HFN.Simultaneously the HFN that preserves of MBMS GW does not change, so the HFN that UE and MBMS GW preserve is inconsistent, then when UE uses the SN composition COUNT of the HFN of its preservation and packet that packet is decoded, will cause decryption error.

As shown in Figure 4, the embodiment of the invention provides a kind of data package processing method at the SC-PTM in the MBMS business, comprising:

S401, receive a plurality of packets;

S402, described a plurality of packets are sorted;

S403, determine to send the mode of packet according to the continuity of the packet after the ordering to user terminal UE.

The embodiment of the invention provides the send mode of packet in a kind of single cell transmission pattern of MBMS business, also avoided the out of order problem of packet simultaneously, and determine to send the mode of packet according to the packet continuity problem to UE, the HFN that makes transmitting terminal and receiving terminal preserve is consistent, thereby makes correctly decrypted data packet of packet receiving terminal.

In conjunction with Fig. 5, a kind of data package processing method that the embodiment of the invention provides is described, this method comprises:

S501, receive a plurality of packets;

In the present embodiment, ENB receives a plurality of packets that MBMS GW sends from the M1 interface.

S502, packet is sorted;

In the present embodiment, can sort according to SN sequence number that comprises in the PDCP head and/or SYNC timestamp, promptly when the SNYC of each packet timestamp was identical, then the SN sequence number according to packet sorted; When the SNYC timestamp not simultaneously, then sort according to the SNYC timestamp; Perhaps, do not consider the SNYC timestamp, and sort according to the SN sequence number.

S503, determine to send the mode of packet according to the continuity of the packet after the ordering.

In the present embodiment,, then directly send these packets if the SN of a plurality of packets that ENB receives is continuous; If the SN of a plurality of packets that ENB receives is discontinuous, promptly have at least a packet also not receive, below this packet is called first packet, then send the preceding packet of first packet earlier, be the packet of SN less than the SN of first packet, for example, if the SN of first packet is 4, then elder generation's transmission SN is 1,2,3 packet.

In the present embodiment, alternatively, when ENB does not receive above-mentioned first packet, the stand-by period is preset in setting, for example can realize by the mode of setting timer, receive first packet in stand-by period if preset, send first packet and first packet continuous data bag (being the continuous packet of SN) afterwards greater than the SN of first packet;

Preset the stand-by period if surpass, ENB does not receive first packet, directly sends the continuous packet of SN greater than the SN of first packet, and up to the next packet that does not receive occurring, the processing mode of this packet is with the method for handling first packet; Perhaps a virtual data bag is set by ENB, and send continuous data bag behind first packet, for example this virtual data bag can only comprise data packet head, perhaps comprise data packet head and particular sequence, this particular sequence can be so that it be the virtual data bag that the packet receiving terminal identifies this packet, and wherein packet packet header comprises the SN of first packet.

In the present embodiment, preset the length of stand-by period and can pass through the chain of command message arrangement, as disposing by multicast coordination entity (MCE) or attended operation entity (OAM); Perhaps by ENB oneself configuration, at this moment, ENB can calculate the length that presets the stand-by period according to the timestamp information and the current time of packet; Also can predesignate, for example set according to the quality of service requirement (QoS) of business by agreement.

In the embodiment of the invention, if above after presetting the stand-by period, ENB receives first packet, no longer sends first packet, handles according to the flow process of above embodiment for other packets that receive.

In the data packet sending method that the embodiment of the invention provides, ENB is according to receiving packet continuity specified data bag send mode, the HFN that makes packet receiving terminal and transmitting terminal preserve is consistent, thereby has avoided the UE end owing to receiving the discontinuous decryption error that causes of packet.

As shown in Figure 6, the embodiment of the invention also provides a kind of data packet processing, is used for single cell pattern of MBMS business, and this receiving system comprises receiving element 601, sequencing unit 602, and transmitting element 603, wherein,

Receiving element 601 is used to receive a plurality of packets;

Sequencing unit 602 is used for a plurality of packets that receiving element 601 receives are sorted;

Transmitting element 603, the result after being used for sorting according to sequencing unit 602 determines to send to UE the mode of packet, and sends packet.

Particularly, sequencing unit 602 can sort to described a plurality of packets according to the synchronized timestamp SYNC and/or the sequence of data packet SN of packet.Transmitting element 603 if determine that the SN of a plurality of packets of receiving is continuous, directly sends packet when sending packet; If when determining that the SN of a plurality of packets of receiving is discontinuous, send the packet of SN less than the SN of first packet that does not receive, at this moment, transmitting element 603, also be used for presetting wait first packet in the stand-by period, if receive this first packet in the stand-by period presetting, send this first packet and SN continuous data bag greater than the SN of first packet, otherwise, only send the continuous data bag of SN greater than the SN of first packet, perhaps send virtual data bag and SN continuous data bag greater than the SN of first packet, this virtual data bag only comprises data packet head, perhaps also comprise particular sequence, it is the virtual data bag that this particular sequence is used for this packet of designation data bag receiving terminal.If above after presetting the stand-by period, receiving element 601 receives first packet, no longer sends first packet.

The data packet processing that the embodiment of the invention provides is according to receiving packet continuity specified data bag send mode, the HFN that makes packet receiving terminal and transmitting terminal preserve is consistent, thereby has avoided the UE end owing to receiving the discontinuous decryption error that causes of packet.

The embodiment of the invention also provides a kind of base station, and this base station comprises above-described data packet processing.

By the description of above embodiment, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.

The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by described protection range with claim.

Claims

1. A data packet processing method in a single cell mode, characterized in that, comprising:

Receive multiple packets;

sorting the plurality of data packets;

The manner of sending the data packets to the user terminal UE is determined according to the continuity of the sorted data packets.

2. The method according to claim 1, wherein said sorting said plurality of data packets is specifically:

The multiple data packets are sorted according to the synchronization time stamp SYNC and/or the data packet sequence number SN of the multiple data packets.

3. The method according to claim 1 or 2, wherein the method of determining to send data packets to the UE according to the continuity of the sorted data packets is specifically:

When the SNs of the multiple data packets are continuous, directly send the multiple data packets;

When the SNs of the plurality of data packets are discontinuous, sending a data packet with an SN smaller than the SN of the first unreceived data packet.

4. The method according to claim 3, wherein when the SNs of the plurality of data packets are discontinuous, if the first data packet is received within the preset waiting time, the first data packet is sent and consecutive data packets with SN greater than the SN of the first data packet.

5. The method according to claim 3 or 4, wherein when the SNs of the plurality of data packets are discontinuous, if the first data packet is not received within the preset waiting time, the SN is sent Continuous data packets whose SN is greater than the first data packet, or send a second data packet and consecutive data packets with an SN greater than the SN of the first data packet, the second data packet contains only the SN of the first data packet, or contains all The SN of the first data packet and the specific sequence used to indicate that the data packet is the second data packet.

6. the method as claimed in claim 4 or 5, is characterized in that, described method also comprises:

If the first data packet is received after the preset waiting time expires, the first data packet is not sent.

7. The method according to any one of claims 4-6, wherein the preset waiting time is calculated and obtained according to the SNYC of the data packet and the current time, or is obtained by the multicast coordination entity MCE or maintenance operation Entity OAM configuration.

8. A device for processing data packets, characterized in that the device is used in a single cell mode, comprising:

a receiving unit, configured to receive multiple data packets;

a sorting unit, configured to sort the multiple data packets received by the receiving unit;

The sending unit is configured to determine the way to send the data packet to the UE according to the sorting result of the sorting unit, and send the data packet.

9. The device according to claim 8, wherein the sorting unit is specifically configured to sort the multiple data packets according to SYNC and/or SN of the data packets.

10. The device according to claim 9, wherein the sending unit is specifically configured to determine that the SNs of the multiple data packets received are continuous according to the sorting result of the sorting unit, and the sending unit is used to Sending the data packets directly; if the sorting result of the sorting unit determines that the SNs of the multiple received data packets are discontinuous, the sending unit is configured to send a data packet with an SN smaller than the SN of the first unreceived data packet.

11. The device according to claim 10, wherein the sending unit is further configured to wait for a preset waiting time when the sorting result of the sorting unit determines that the SNs of the multiple data packets received are discontinuous , if the first data packet is received within the preset waiting time, sending the first data packet and consecutive data packets whose SN is greater than the SN of the first data packet.

12. The device according to claim 10 or 11, wherein the sending unit is further configured to wait for the preset when the sorting result of the sorting unit determines that the SNs of the multiple data packets received are not continuous Waiting time, if the first data packet is not received within the preset waiting time, send continuous data packets whose SN is greater than the SN of the first data packet, or send the second data packet and continuous data packets whose SN is greater than the SN of the first data packet , the second data packet includes the SN of the first data packet, or includes the SN of the first data packet and a sequence number used to indicate that the data packet is the second data packet.

13. A base station, characterized in that the base station comprises the device for processing data packets according to any one of claims 8-12.