CN103118403A - Inter-base station seamless handover method for terminal equipment in wireless communication system - Google Patents
Inter-base station seamless handover method for terminal equipment in wireless communication system Download PDFInfo
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- CN103118403A CN103118403A CN2013100296203A CN201310029620A CN103118403A CN 103118403 A CN103118403 A CN 103118403A CN 2013100296203 A CN2013100296203 A CN 2013100296203A CN 201310029620 A CN201310029620 A CN 201310029620A CN 103118403 A CN103118403 A CN 103118403A
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Abstract
The invention relates to an inter-base station seamless handover method for terminal equipment in a wireless communication system. The inter-base station seamless handover method includes: adding a data buffer entity on base stations of the wireless communication system, wherein a plurality of base stations correspond to one data buffer entity; for a downstream data communication process transmitted to a terminal at a network side, by the aid of the data buffer entity, adding sequence number information to downstream data packages transmitted to the terminal and directly transmitting the downstream data packages to the base station where the terminal is positioned, and continuously backing up the sequence number information added downstream data packages in a buffering area in the data buffer entity. By the aid of the inter-base station seamless handover method, a large number of signaling interaction processes are reduced, signaling, data transmission and receiving processes are simplified, and abnormal errors are not prone to generating.
Description
Technical field
The present invention relates to terminal equipment in a kind of wireless communication system across the method for base station seamless switching.
Background technology
The existing wireless communications system is when terminal during from a base station movement to another base station, need to be switched between source base station and target BS in data transmission procedure.Therefore, in the radio communication system data transmitting procedure, when terminal carries out switching across the base station, terminal need to transfer to network side with the upstream data bag by source base station and target BS, and by the base station to the upstream data bag carry out out of order rearrangement, packet loss retransmit control, duplicate packages detects and abandon, lost data packets in handoff procedure is completed the packet loss retransmitting function by terminal.For downlink data transmission, terminal receives from the network side data bag at source base station and target BS respectively, and completes the packet loss retransmitting function by the base station.After terminal switched to target BS, in source base station, the not complete downlink data packet of terminal, the upstream data bag of not completing splicing and relevant control face and the data surface contextual information of being sent to, need to migrate to target BS from source base station.
Prior art specific implementation process is as shown in Figure 1:
1) terminal is carried out the up-downgoing transfer of data with source base station before not switching, and feedback relevant control information is to complete the up-downgoing Retransmission control.
2) when switching, source base station sends sequence of data packet information to target BS, and according to this sequence number information will be buffered in source base station and the not complete downlink data packet that sends to terminal equipment, the upstream data bag of not completing splicing moves to target BS.This data migration process ensures the packet transmitting that is buffered in source base station in handoff procedure.
3) source base station sends switching command message to terminal, and terminal equipment receives and carries out and switches message, accesses at target BS according to the parameter of switching message.
4) the terminal check successful switch after target BS, is reported the information such as sequence of data packet information and packet buffering state to target BS by signaling.
5) after terminal switched to target BS, source base station and target BS carried out the gateway path handoff procedure.
6) the terminal switching is completed, and itself and target BS carry out the up-downgoing transfer of data, and target BS and gateway carry out the up-downgoing transmission.When occuring to switch across the base station in terminal and network up and down data transmission procedure, source base station record data packet number also cushions the up-downgoing packet, source base station sends sequence of data packet number, needs data and relevant control face and the data surface contextual information of migration to target BS, when terminal switched to target BS, target BS and terminal were proceeded the up-downgoing data packet transmission according to relevant information; If terminal or target BS do not receive correct, whole packets in this process, need Signalling exchange between terminal, source base station, target BS, according to the packet of sequence of data packet information retransmits lost; After terminal was completed across the base station switching, source base station and target BS carried out the gateway path handoff procedure.
From above terminal switching flow, can find out: 1) in terminal and network side up-downgoing data transmission procedure, when terminal is switched across the base station, be buffered in and not completely in source base station be sent to the downlink data packet of terminal, the upstream data bag of not completing splicing and relevant control face and the data surface contextual information need to move to target BS from source base station.If particularly data-bag lost in transmitting procedure, need source base station and target BS to consult and resend the missing data bag.This technical scheme needs a large amount of Signalling exchanges between source base station and target BS, and increases the transfer of data time-delay in the packet transition process, easily produces signaling, data transmission exception situation; 2) in terminal and network side up-downgoing data transmission procedure, when switching across the base station in order to ensure terminal, the packet of transmission is not lost, existing scheme needs terminal and source base station Signalling exchange, terminal and target BS Signalling exchange, source base station and target BS Signalling exchange, target BS and gateway Signalling exchange are in order to guarantee the integrality of data.This technical scheme needs a large amount of Signalling exchanges, and increases the transfer of data time-delay in the business datum transition process, easily produces signaling, data transmission exception situation.That is to say, when the data packet transmission mistake occuring, when transmission is lost, all needing the feedback of complexity, a large amount of Signalling exchange and data to complete data and again transmit.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of wireless communication system and realizes that terminal equipment is across the method for base station seamless switching, with when data packet transmission mistake, transmission loss occur, reduce a large amount of Signalling exchange flow processs, simplified signaling, data input and data output flow process, and be difficult for producing exception error.
The present invention is achieved through the following technical solutions:
A kind of radio communication system terminal is realized the method across the base station data seamless switching, it is characterized in that, described method comprises: increase the data buffer entity on radio communication system base station, the corresponding data buffer entities in a plurality of base stations; Transfer to the downlink data communication process of terminal for network side, the downlink data packet that mails to terminal is added sequence number information by the data buffer entity and directly is sent to this terminal resident base station, simultaneously the downlink data packet of adding after sequence number information is continued backup in the buffering area of data buffer entity inside; Terminal is carried out across in the handoff procedure of base station, the sequence of data packet information exchange that terminal will correctly receive at last crosses source base station or target BS feeds back to the data buffer entity, the backup that this packet is follow-up of data buffer entity in the inner other Packet Generations of section's buffering area to target BS, by target BS with these other Packet Generations to terminal; The data buffer entity and the downlink data packet that the network side of newly receiving mails to terminal is added sequence number information after be sent to simultaneously source base station and target BS, and by source base station and purpose base station, its downlink data packet is sent to terminal simultaneously, before wherein switching, the resident base station of this terminal is source base station, and after switching, the resident base station of this terminal is target BS.
For terminal upstream data communication process, the data buffer entity is as the upstream data bag with sequence number information of fixing point reception sources self terminal, and according to sequence number information complete the out of order rearrangement, the packet loss Retransmission control that comprise the upstream data bag, duplicate packages detects and be discarded in function.
The upstream data bag that is derived from terminal that the data buffer entity is received can be from one or more base stations, when terminal does not carry out switching across the base station, the upstream data bag by the current resident base-station transmission of terminal to the data buffer entity; When terminal carried out switching across the base station, the upstream data bag transferred to the data buffer entity by source base station or target BS.
When downlink data packet after sequence number information is added in the backup of the buffering area of data buffer entity inside, adopt the first-in first-out principle, when buffering area is full, the packet that deposits in the earliest in formation is cleared out and deposit in the up-to-date packet of receiving.
When terminal does not carry out switching across the base station, network side mails to the downlink data packet of terminal, added directly being sent to terminal resident base station after sequence number information by the data buffer entity, and by this base-station transmission to terminal, coordinate terminal to complete the functions of retransmission of downlink data packet by this base station.
Switch complete after, after the downlink data packet that the network side of newly receiving mails to terminal is added sequence number information by the data buffer entity, only mail to terminal resident base station.
Hence one can see that, and this technical scheme mainly contains 3 points:
1) add the data buffer entity on radio communication system base station, the corresponding data buffer entities in a plurality of base stations; For terminal upstream data communication process, the data buffer entity, and carries out out of order rearrangement, packet loss Retransmission control, duplicate packages to the upstream data bag and detects and discard from the business data packet of (one or more) base station (when switching across the base station terminal uplink transmission data can by two base-station transmissions to the data buffer entity) as fixing point reception sources self terminal.
2) for terminal downlink data communication process, the packet that mails to terminal adds sequence number information by the data buffer entity and directly is sent to terminal resident base station, simultaneously packet is continued to back up in the buffering area of section within it.
3) terminal is carried out across in the handoff procedure of base station, the sequence of data packet information exchange that terminal will correctly receive at last crosses source base station or target BS feeds back to the data buffer entity, data buffer entity other Packet Generations that are buffered in its internal buffer that this packet is follow-up are to target BS, and are sent to simultaneously source base station and target BS after the downlink data packet that the network side of newly receiving mails to terminal is added sequence number; Switch complete after, after the downlink data packet that the network side of newly receiving mails to terminal is added sequence number by the data buffer entity, only mail to terminal resident base station.
The sequence number information that in this scheme, the data buffer entity continues buffered data packet and adds packet, the data buffer entity is preserved whole packet in whole handoff procedure, and record sequence number information whole in handoff procedure, so that the packet of all uplink downlink transmission has buffering in switching all processes, and its sequence information has record; Utilize the method, the any end lost data packets of uplink downlink in handoff procedure, only need by the buffer sequence package informatin notification data buffer entities of message with last correct reception, it resends business data packet according to the sequence package informatin can solve the handoff procedure data loss problem; The method reduces a large amount of Signalling exchange flow processs, has simplified signaling, data input and data output flow process, is difficult for producing exception error.
Description of drawings
Fig. 1 is the method for switching across the base station in prior art;
Fig. 2 is the method that the present invention is switched across the base station.
Embodiment
Increase the data buffer entity between wireless communication system network side group station and gateway, the corresponding data buffer entities in a plurality of base stations; This entity cushions and each packet is added sequence number information the data that gateway sends to wireless terminal; Be in wireless terminal and gateway up-downgoing data communication process, the data buffer entity is kept at a series of packets in buffer and adds sequence number information, data-bag lost is arranged when switching across the base station when terminal equipment, terminal equipment will the last correct sequence of data packet that receives number sends to the data buffer entity by source base station or target BS, and buffer will resend terminal equipment with terminal equipment missing data bag according to this sequence number.
This technical scheme is described in detail as shown in Figure 2:
1) the up-downgoing transfer of data is carried out in terminal and base station, in terminal not before base station shifting, the packet that mails to terminal adds sequence number information by the data buffer entity and directly is sent to terminal resident base station, simultaneously packet is continued to back up in the buffering area of section within it.When downlink data packet after sequence number information is added in the backup of the buffering area of data buffer entity inside, adopt the first-in first-out principle, when buffering area is full, the packet that deposits in the earliest in formation is cleared out and deposit in the up-to-date packet of receiving.
2) when the terminal base station shifting, carry out Signalling exchange between terminal and source base station, begin to carry out handoff procedure.
3) in the handoff procedure of base station, the terminal upstream data can be sent to the data buffer entity with the form of packet by source or target BS, this upstream data bag has sequence number information, this entity reorders, detects duplicate packages and abandon out of order packet according to its sequence number information, and this entity coordinates with the base station completes the packet loss retransmitting function.
4) downlink data packet that is derived from network side in the handoff procedure of base station can be sent to terminal by source or target BS, the sequence of data packet information exchange that terminal will correctly receive at last crosses source base station or target BS feeds back to the data buffer entity, data buffer entity other Packet Generations that are buffered in its internal buffer that this packet is follow-up are to target BS, and are sent to simultaneously source base station and target BS after the downlink data packet that the network side of newly receiving mails to terminal is added sequence number;
5) after switching was completed, target BS was sent to the data buffer entity with path handover request message.After the downlink data packet that the network side of newly receiving after the data buffer entity mails to terminal is added sequence number by the data buffer entity, only mail to terminal resident base station, target BS continues this data packet transmission to terminal.
Sum up the technical program, the terminal upstream data by the capable data packet disorder of data buffer entity reset, duplicate packages detects and abandon, and coordinate with the base station and complete the packet loss retransmitting function.The network side downlink data is carried out by the data buffer entity and is cushioned and to add sequence number information, when extremely causing its down link lost data packets in handoff procedure or by other, only need by the sequence of data packet information exchange primary data buffer entities of message with last correct reception, it resends packet according to the sequence package informatin can solve the handoff procedure data loss problem; The method reduces a large amount of Signalling exchange flow processs, has simplified signaling, data input and data output flow process, is difficult for producing exception error.
Claims (6)
1. a radio communication system terminal is realized the method across the base station data seamless switching, it is characterized in that, described method comprises: increase the data buffer entity on radio communication system base station, the corresponding data buffer entities in a plurality of base stations; Transfer to the downlink data communication process of terminal for network side, the downlink data packet that mails to terminal is added sequence number information by the data buffer entity and directly is sent to this terminal resident base station, simultaneously the downlink data packet of adding after sequence number information is continued backup in the buffering area of data buffer entity inside; Terminal is carried out across in the handoff procedure of base station, the sequence of data packet information exchange that terminal will correctly receive at last crosses source base station or target BS feeds back to the data buffer entity, the backup that this packet is follow-up of data buffer entity in the inner other Packet Generations of section's buffering area to target BS, by target BS with these other Packet Generations to terminal; The data buffer entity and the downlink data packet that the network side of newly receiving mails to terminal is added sequence number information after be sent to simultaneously source base station and target BS, and by source base station and purpose base station, its downlink data packet is sent to terminal simultaneously, before wherein switching, the resident base station of this terminal is source base station, and after switching, the resident base station of this terminal is target BS.
2. the method for claim 1, it is characterized in that, for terminal upstream data communication process, the data buffer entity is as the upstream data bag with sequence number information of fixing point reception sources self terminal, and according to sequence number information complete the out of order rearrangement, the packet loss Retransmission control that comprise the upstream data bag, duplicate packages detects and be discarded in function.
3. method as claimed in claim 2, it is characterized in that, the upstream data bag that is derived from terminal that the data buffer entity is received can be from one or more base stations, when terminal does not carry out switching across the base station, the upstream data bag by the current resident base-station transmission of terminal to the data buffer entity; When terminal carried out switching across the base station, the upstream data bag transferred to the data buffer entity by source base station or target BS.
4. as the described method of claim 1-3 any one, it is characterized in that, when terminal does not carry out switching across the base station, network side mails to the downlink data packet of terminal, added by the data buffer entity and directly be sent to terminal resident base station after sequence number information, and pass through this base-station transmission to terminal, coordinate terminal to complete the functions of retransmission of downlink data packet by this base station.
5. as the described method of claim 1-4 any one, it is characterized in that, switch complete after, after the downlink data packet that the network side of newly receiving mails to terminal is added sequence number information by the data buffer entity, only mail to terminal current resident base station.
6. as the described method of claim 1-5 any one, it is characterized in that, when downlink data packet after sequence number information is added in the backup of the buffering area of data buffer entity inside, adopt the first-in first-out principle, when buffering area is full, the packet that deposits in the earliest in formation is cleared out and deposits in the up-to-date packet of receiving.
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| CN110383787A (en) * | 2017-03-31 | 2019-10-25 | 华为技术有限公司 | A kind of data migration method and device |
| CN111314866A (en) * | 2018-12-11 | 2020-06-19 | 中国电信股份有限公司 | Communication method and communication system for voice service |
| CN111903154A (en) * | 2019-02-12 | 2020-11-06 | Oppo广东移动通信有限公司 | Method and apparatus for wireless communication |
| WO2023024720A1 (en) * | 2021-08-27 | 2023-03-02 | 北京希姆计算科技有限公司 | Data transmission method and system, integrated circuit, multi-chip structure, and electronic device |
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| CN1949925A (en) * | 2005-10-10 | 2007-04-18 | 华为技术有限公司 | Smooth switching method for use in LTE technique |
| JP2007129593A (en) * | 2005-11-04 | 2007-05-24 | Ntt Docomo Inc | Data transfer method and base station |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110383787A (en) * | 2017-03-31 | 2019-10-25 | 华为技术有限公司 | A kind of data migration method and device |
| CN110383787B (en) * | 2017-03-31 | 2021-09-14 | 华为技术有限公司 | Data migration method and device |
| US11240712B2 (en) | 2017-03-31 | 2022-02-01 | Huawei Technologies Co., Ltd. | Data migration method and apparatus |
| CN111314866A (en) * | 2018-12-11 | 2020-06-19 | 中国电信股份有限公司 | Communication method and communication system for voice service |
| CN111314866B (en) * | 2018-12-11 | 2021-11-26 | 中国电信股份有限公司 | Communication method and communication system for voice service |
| CN111903154A (en) * | 2019-02-12 | 2020-11-06 | Oppo广东移动通信有限公司 | Method and apparatus for wireless communication |
| CN111903154B (en) * | 2019-02-12 | 2022-03-11 | Oppo广东移动通信有限公司 | Method and apparatus for wireless communication |
| WO2023024720A1 (en) * | 2021-08-27 | 2023-03-02 | 北京希姆计算科技有限公司 | Data transmission method and system, integrated circuit, multi-chip structure, and electronic device |
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