CN104519477A - Method for identifying congestion caused by Xn interface and controlling receiving window - Google Patents
Method for identifying congestion caused by Xn interface and controlling receiving window Download PDFInfo
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- CN104519477A CN104519477A CN201310454723.4A CN201310454723A CN104519477A CN 104519477 A CN104519477 A CN 104519477A CN 201310454723 A CN201310454723 A CN 201310454723A CN 104519477 A CN104519477 A CN 104519477A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0284—Traffic management, e.g. flow control or congestion control detecting congestion or overload during communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/11—Identifying congestion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/27—Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0289—Congestion control
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Abstract
The invention relates to a method for identifying congestion caused by an Xn interface in a plural-connectivity communication system with a macro cell and a small cell so as to control a corresponding protocol layer window. The method includes the following steps that: a base station of the small cell receives a downlink data packet from a base station of the macro cell through the Xn interface and detects the downlink data packet; and the base station of the small cell determines whether the congestion caused by the Xn interface exists according to detection results, and notifies a user at downlink or uplink not to stop the corresponding protocol layer window at the station after detecting the Xn congestion. The invention also relates to a base station apparatus executing the above method.
Description
Technical field
The application relates generally to the communication technology, especially, relates to the method identifying in multi-link communication system and caused congested method by Xn interface and controlled receive window accordingly.
Background technology
Because low power nodes can bring the gain of capacity amplification and blind spot covering aspect, more and more study in deployment emphasis being pointed to the small-cell (small cell) covered by low power nodes and enhancing.Here, low power nodes can be small base station, and its example includes but not limited to the low power base station such as Pico, Femto.In 3GPP R12, new research project " Small Cell Enhancements for E-UTRA and E-UTRANHigher-layer aspects " (" strengthen for the small-cell of the high-rise aspect of E-UTRA and E-UTRAN) " be given the ratification, and one of them emphasis be to support between macrocell (community of covering is provided by macro base station) and small-cell two/multi-link (dual/pluralconnectivity).
In such multi-link communication system, small-cell base station is communicated by Xn interface with macro cell base station, and described Xn interface has non-ideal characteristics, may occur congested and have longer delay and loss of data.
Congestion avoidance mechanism is comprised in Transmission Control Protocol.There occurs congested after, TCP layer can packet discard.More rare in view of causing congested situation by Xn interface, the packet therefore abandoned by this congestion effects does not have a great impact for final Consumer's Experience.But wireless link or air interface are very unstable, so the means that traditional re-transmission will be adopted defeated etc. to the data-bag lost because eating dishes without rice or wine to produce are to ensure the correct transmission of data, otherwise Consumer's Experience will be had a greatly reduced quality.
Summary of the invention
Current faced situation be the data-bag lost that caused by air interface likely and the congested or data-bag lost caused by Xn interface may exist simultaneously.Although the congested or data-bag lost caused due to Xn interface is little for Consumer's Experience impact, and the data-bag lost caused for air interface must take the measures such as re-transmission to be processed in time, otherwise will affect Consumer's Experience.And how the two to be made a distinction be a problem demanding prompt solution.
Therefore, in order to overcome the problems referred to above, according to an embodiment of the application provide a kind of in the multi-link communication system with macrocell and small-cell for identifying the congested method caused by Xn interface, comprising: the base station of described small-cell is detected described downlink data packet from the base station downlink data receiving bag of described macrocell through described Xn interface; And described small-cell base station according to the result of described detection determine whether there is by described Xn interface cause congested.
Especially, described detection comprises and reordering to described downlink data packet according to the sequence number of described downlink data packet; Described method also comprises, when the described result that reorders shows described downlink data packet existence loss, described small-cell base station determine to exist by described Xn interface cause congested, and direct notice or by described macro cell base station notifying user equipment not cause congested of Xn interface described in essential factor and stop the slip of described subscriber equipment receive window.
Especially, reorder described in and to carry out based on GTP sequence number.
Especially, described reordering is carried out based on the type of described downlink data packet transmitted by described Xn interface and the carrying Fractionation regimen between described macrocell and described small-cell, wherein when described downlink data packet is PDCP packet, and between described macrocell and described small-cell, there is not carrying segmentation, then reorder described in and to carry out based on PDCP sequence number; When described downlink data packet is RLC packet, and between described macrocell and described small-cell, there is not carrying segmentation, then reorder described in and to carry out based on RLC data sequence number; Or when there is carrying segmentation between described macrocell and described small-cell, then reorder described in and to carry out based on GTP sequence number.
A kind of congested method for assisting identification to be caused by Xn interface in the multi-link communication system with macrocell and small-cell is provided according to an embodiment of the application, comprise: the base station of described small-cell receives upstream data bag through air interface from subscriber equipment, and detect described upstream data bag and whether there is loss; Described small-cell base station determines whether there is the data-bag lost caused by described air interface based on described testing result; And the described upstream data bag received by it is transmitted to the base station of described macrocell by described small-cell base station through described Xn interface, and notify that air interface described in described macro cell base station causes the packet sequence number of loss by status report, for described macro cell base station identify by described Xn interface cause congested time cause the packet sequence number of loss to be got rid of described by described air interface.
Especially, detect and comprise described small-cell base station to carry out re-transmission to described upstream data bag defeated or reorder, and the packet sequence number of described loss is PDCP or RLC sequence number.
According to an embodiment of the application provide a kind of in the multi-link communication system with macrocell and small-cell for identifying the congested method caused by Xn interface, the base station comprising described macrocell receives upstream data bag through the base station of described Xn interface from described small-cell and detects described upstream data bag; And described macro cell base station according to the result of described detection determine whether there is by described Xn interface cause congested.
Especially, described detection comprises reorders to described upstream data bag based on GTP sequence number, and judges whether described upstream data bag has loss; Described method also comprises, when described upstream data is surrounded by loss, described macro cell base station determine exist by described Xn interface cause congested, do not cause the slip of the receive window of congested stopping equivalent layer due to described Xn interface.
Especially, described detection carries out based on the type of described upstream data bag and the carrying Fractionation regimen between described macrocell and described small-cell, wherein when described upstream data bag is PDCP packet, and do not exist between described macrocell and described small-cell and carry when splitting, then described method also comprises described macro cell base station from described small-cell base station receiving state report, the air interface that at least comprises wherein said status report causes the PDCP sequence number of the packet of loss, described detection comprises described macro cell base station and reorders to described upstream data bag based on PDCP sequence number, and determine wherein except packet corresponding to the PDCP sequence number comprised in described status report, whether described upstream data bag also exists any loss, or when described upstream data bag is RLC packet, and do not exist between described macrocell and described small-cell and carry when splitting, then described method also comprises described macro cell base station from described small-cell base station receiving state report, the RLC sequence number of the packet of loss is caused comprising described air interface, described detection comprises described macro cell base station and reorders to described upstream data bag based on RLC sequence number, and determine whether described upstream data bag also exists any loss wherein except packet corresponding to the RLC sequence number comprised in described status report.
Especially, still when there is loss in described upstream data bag except the packet that the sequence number except comprising in described status report is corresponding, described macro cell base station determine to exist by described Xn interface cause congested, the slip of the congested stopping receive window not causing because of described Xn interface.
Especially, exist and carry when splitting between described macrocell and described small-cell, described detection comprises described macro cell base station and to reorder to described upstream data bag based on GTP sequence number thus judge whether described upstream data bag has loss.
According to the embodiment of the application provide a kind of base station equipment for performing aforementioned either method.
The method and apparatus provided in the embodiment of the present invention is provided, not only can effectively to the data-bag lost caused by air interface and congestedly being distinguished of being caused by Xn interface, thus it is congested and stops slip because Xn interface produces effectively can to prevent equivalent layer receive window.So, not only ensure that the quality of Consumer's Experience, also save system resource.
Accompanying drawing explanation
Figure 1 shows that and in multi-link communication system, identify the congested communication process schematic diagram caused at down link by Xn interface according to one embodiment of the invention;
Figure 2 shows that and in multi-link communication system, identify the congested communication process schematic diagram caused in up link by Xn interface according to one embodiment of the invention;
Figure 3 shows that and described according to a further embodiment of the invention in multi-link communication system, identify the congested communication process schematic diagram caused in up link by Xn interface; And
Fig. 4 (a)-(d) is depicted as four kinds of user face multi-link communication system architecture schematic diagrames according to embodiments of the invention.
Embodiment
Discuss manufacture and the use of the embodiment of the application below in detail.But, should be understood that, the invention provides many feasible inventive concept can implemented under various concrete background.The specific embodiment discussed is only illustrate manufacture and use concrete mode of the present invention, does not limit the scope of the invention.
Figure 1 shows that and in the multi-link communication system with macrocell and small-cell, identify the congested communication process schematic diagram caused at down link by Xn interface according to one embodiment of the invention.
Macro cell base station MeNB110 comprises packet data convergence protocol (packet dataconvergence protocol, be called for short PDCP), wireless spread-spectrum technology (radio link control, be called for short RLC) layer, and media access control layer (media access control is called for short MAC).Small-cell base station SeNB200 also comprises rlc layer and MAC layer.In the user face multi-link communication system architecture shown in Fig. 4 (a), MeNB100 produces PDCP packet at its PDCP layer, and is transferred to the rlc layer of SeNB200 via Xn interface.Be carried on not segmentation between MeNB100 and SeNB200, carrying data can only be transferred to user equipment (UE) 300 by SeNB200.
For this framework, in process as shown in Figure 1, transmit descending PDCP packet by Xn interface to SeNB200 in step S301, MeNB100.Packet received by it is reordered based on PDCP sequence number in step S302, SeNB200.Because packet is not necessarily received by SeNB200 in order, therefore lost which packet just can be known in the transmitting procedure through Xn interface by operation of reordering.
In step S303, in time there is loss in the downlink data packet that SeNB200 finds received by it, just determine exist by Xn interface cause congested.Will UE300 be notified in step S304, SeNB200, not stop the slip of the receive window of UE300 because of caused by Xn interface congested.According to an embodiment, the sequence number of the downlink data packet of losing because of Xn interface congestion can be informed UE300 by SeNB200.According to another embodiment, SeNB200 can step S304 inform MeNB100 exist by Xn interface cause congested.Notify that UE300 does not stop the slip of receive window because of caused by Xn interface congested in step S305 ', MeNB100.
Fig. 4 (b) Suo Shi in the multi-link communication system architecture of user face, MeNB100, at its rlc layer, also claims main rlc layer, produces RLC packet, and also claims from rlc layer via the rlc layer that Xn interface is transferred to SeNB200.Same, be carried on not segmentation between MeNB100 and SeNB200, carrying data can only be transferred to user equipment (UE) 300 by SeNB200.
The communication process of the multi-link communication system shown in Fig. 4 (b) and the communication process basic simlarity about the multi-link communication system shown in Fig. 4 (a) described above, difference is that the packet transmitted through Xn interface is RLC packet.Downlink data packet received by it is reordered based on the sequence number of RLC in step S302, SeNB200.
According to one embodiment of present invention, for the multi-link communication system shown in Fig. 4 (a) and (b), GPRS Tunnel Protocol (the GPRS tunneling protocol that SeNB200 also can adopt Xn interface special, be called for short GTP) and corresponding GTP sequence number the downlink data packet received by it is reordered operation, and determine to there occurs by Xn interface cause congested time, notice UE300 corresponding PDCP layer or rlc layer not cause congested of essential factor Xn interface and stop the slip of its receive window.
In the multi-link communication system architecture shown in Fig. 4 (c), MeNB100 produces PDCP packet at its PDCP layer, and via Xn interface be transferred to SeNB200 rlc layer but with the framework in Fig. 4 (a) unlike, be carried between MeNB100 and SeNB200 and split to some extent, carrying data both can be transferred to user equipment (UE) 300 by SeNB200, also can directly be transferred to user equipment (UE) 300 by MeNB100.
Fig. 4 (d) Suo Shi in the multi-link communication system architecture of user face, MeNB100 produces RLC packet at main rlc layer, and via Xn interface be transferred to SeNB200 from rlc layer.But with the framework in Fig. 4 (b) unlike, be carried between MeNB100 and SeNB200 and split to some extent, carrying data both can be transferred to user equipment (UE) 300 by SeNB200, also can directly be transferred to user equipment (UE) 300 by MeNB100.
For the communication system with above-mentioned two kinds of frameworks, owing to there is the segmentation of radio bearer, therefore just can not reorder based on PDCP or RLC sequence number again.Even if because SeNB200 end find the disappearance that there is downlink data packet do not necessarily represent yet exist by Xn interface cause congested.Those look disappearance packet in partly or entirely may be transferred to UE300 by MeNB100.Therefore, for the communication system shown in Fig. 4 (c) He Fig. 4 (d), can only reorder based on GTP agreement.The reason why GTP agreement still can carry out data-bag lost statistics in this case is accurately, GTP agreement be for base station between point to point protocol, only can pay close attention to based on GTP agreement the packet that MeNB100 is transferred to SeNB200 to carry out monitoring and sorting, and not consider that those directly send to the packet of UE300 by MeNB100.
Figure 2 shows that and in the multi-link communication system with macrocell and small-cell, identify the congested communication process schematic diagram caused in up link by Xn interface according to one embodiment of the invention.
For the communication system shown in Fig. 4 (a), send upstream data bag by air interface to SeNB200 in step S401, UE300.Because air interface/wireless link is very unstable; usually can there is the situation of lost data packets; defeated and/or the reordering function module of the re-transmission that therefore it will be utilized to have in step S402, SeNB200 detects the upstream data bag received by it and/or retransmits.
In step S403, lost when SeNB200 finds that it is surrounded by from the upstream data that UE300 receives, then determined to there is the data-bag lost caused by air interface, thus the sequence number of lost packet is preserved.
Its upstream data bag received from UE300 can be transmitted to MeNB100 through Xn interface in step S404, SeNB200, the mode of status report also can be adopted in addition to cause the sequence number of the packet of loss to inform MeNB100 by above-mentioned by air interface.For the communication system shown in Fig. 4 (a), the packet that SeNB200 is transmitted to MeNB100 is PDCP packet.
Based on PDCP sequence number, the forwarding uplink data bag received by it is reordered at PDCP layer in step S405, MeNB100.That determines to report except SeNB200 in step S406, MeNB100 causes except the packet of loss due to air interface, still there is the loss of other packets.Therefore determine exist by Xn interface cause congested.In step S407, MeNB100 can not stop the slip of its receive window because of cause congested of Xn interface, the receive window of MeNB100 can not wait for those packets lost because of Xn interface congestion in other words, but directly gives other equipment by the forwarding uplink data Packet forwarding received by it.
For the communication system shown in Fig. 4 (b), it identifies that the congested communication process caused in up link by Xn interface is substantially similar with the communication process of system Fig. 4 (a) shown, RLC packet unlike the packet being transmitted to MeNB100 in step S404, SeNB200.Forwarding uplink data bag received by it is reordered based on RLC sequence number in step S405, MeNB100.
Figure 3 shows that and described according to a further embodiment of the invention in the multi-link communication system with macrocell and small-cell, identify the congested communication process schematic diagram caused in up link by Xn interface.
According to one embodiment of present invention, for the multi-link communication system shown in Fig. 4 (a) and Fig. 4 (b), also can by communication process as shown in Figure 3 to congestedly being identified of being caused by Xn interface.In step 501, UE300 sends upstream data bag through air interface to SeNB200.Its upstream data bag received is forwarded through Xn interface to MeNB100 in step S502, SeNB200.GTP agreement and corresponding GTP sequence number is adopted to reorder operation to the forwarding uplink data bag received by it in step S503, MeNB100.Find that the packet that SeNB200 is transmitted to it is lost to some extent in step S504, MeNB100, then determine to exist that Xn interface causes is congested, therefore do not stop the slip of the corresponding PDCP of MeNB100 or rlc layer receive window.
According to another embodiment of the present invention, for the multi-link communication system shown in Fig. 4 (c) He Fig. 4 (d), owing to there is carrying segmentation between MeNB100 and SeNB200, therefore except step S501, also may there is S501 ', UE300 may directly to MeNB100 transmit ascending data bag in this step.Similar with the situation of downlink transfer, in the multi-link communication system that there is carrying segmentation, if still utilize PDCP or RLC sequence number to reorder to the upstream data bag received by MeNB100, cannot to whether there is congestedly being judged accurately of being caused by Xn interface.Therefore, concerning the multi-link communication system shown in Fig. 4 (c) He Fig. 4 (d), GTP agreement can only be adopted to reorder based on GTP sequence number, thus judge whether the upstream data bag being undertaken transmitting by Xn interface exists the situation of loss.
In sum, the application provide not only for identify there is macrocell and small-cell multi-link communication system in the congested method that caused by Xn interface, additionally provide and avoid because of cause congested of Xn interface and the method stopping receive window sliding.
According to an embodiment of the application, in MeNB100 and SeNB200 of multi-link system above-mentioned, all comprise corresponding GTP functional module (not shown).When adopting PDCP or RLC sequence number to carry out reordering, the GTP protocol section conductively-closed in packet, and when adopting GTP sequence number to reorder, then operate based on the GTP protocol section in packet.
Those skilled in the art are easy to just learn, can change materials and methods in scope of the present utility model.Should also be understood that except for illustration of except the concrete linguistic context of embodiment, the utility model provides many applicable inventive concept.Correspondingly, claims are intended to such process, machine, manufacture, material synthesis, device, method or step to be included in their scope.
Claims (12)
1. in the multi-link communication system with macrocell and small-cell for identifying the congested method caused by Xn interface, comprising:
The base station of described small-cell is detected described downlink data packet from the base station downlink data receiving bag of described macrocell through described Xn interface; And
Described small-cell base station according to the result of described detection determine whether there is by described Xn interface cause congested.
2. the method for claim 1, wherein said detection comprises reorders to described downlink data packet according to the sequence number of described downlink data packet;
Described method also comprises, when the described result that reorders shows described downlink data packet existence loss, described small-cell base station determine to exist by described Xn interface cause congested, and direct notice or by described macro cell base station notifying user equipment not cause congested of Xn interface described in essential factor and stop the slip of described subscriber equipment receive window.
3. method as claimed in claim 2, wherein said reordering is carried out based on GTP sequence number.
4. method as claimed in claim 2, wherein said reordering is carried out based on the type of described downlink data packet transmitted by described Xn interface and the carrying Fractionation regimen between described macrocell and described small-cell, wherein
When described downlink data packet is PDCP packet, and between described macrocell and described small-cell, there is not carrying segmentation, then reorder described in and to carry out based on PDCP sequence number;
When described downlink data packet is RLC packet, and between described macrocell and described small-cell, there is not carrying segmentation, then reorder described in and to carry out based on RLC data sequence number; Or
Between described macrocell and described small-cell, there is carrying segmentation, then reorder described in and to carry out based on GTP sequence number.
5. in the multi-link communication system with macrocell and small-cell, identifying for assisting the congested method caused by Xn interface, comprising:
The base station of described small-cell receives upstream data bag through air interface from subscriber equipment, and detects described upstream data bag;
Described small-cell base station finds that described upstream data bag there occurs loss, then record the packet sequence number of described loss; And
Described upstream data bag received by it is transmitted to the base station of described macrocell by described small-cell base station through described Xn interface, and notify that described macro cell base station causes the packet sequence number of loss by described air interface by status report, for described macro cell base station identify by described Xn interface cause congested time to causing the packet sequence number of loss to be got rid of because of described air interface.
6. method as claimed in claim 5, wherein detects and comprise described small-cell base station to carry out re-transmission to described upstream data bag defeated or reorder, and the packet sequence number of described loss is PDCP or RLC sequence number.
7. in the multi-link communication system with macrocell and small-cell for identifying the congested method caused by Xn interface, comprising:
The base station of described macrocell receives upstream data bag through the base station of described Xn interface from described small-cell and detects described upstream data bag; And
Described macro cell base station according to the result of described detection determine whether there is by described Xn interface cause congested.
8. method as claimed in claim 7, wherein said detection comprises reorders to described upstream data bag based on GTP sequence number, and judges whether described upstream data bag has loss;
Described method also comprises, when described upstream data is surrounded by loss, described macro cell base station determine exist by described Xn interface cause congested, do not cause the slip of the receive window of congested stopping equivalent layer because of described Xn interface.
9. method as claimed in claim 7, wherein said detection carries out based on the type of described upstream data bag and the carrying Fractionation regimen between described macrocell and described small-cell, wherein
When described upstream data bag is PDCP packet, and do not exist between described macrocell and described small-cell and carry when splitting, then described method also comprises described macro cell base station from described small-cell base station receiving state report, the air interface that is at least included in wherein said status report causes the PDCP sequence number of the packet of loss, described detection comprises described macro cell base station and reorders to described upstream data bag based on PDCP sequence number, and determine wherein except packet corresponding to the PDCP sequence number comprised in described status report, whether described upstream data bag also exists any loss, or
When described upstream data bag is RLC packet, and do not exist between described macrocell and described small-cell and carry when splitting, then described method also comprises described macro cell base station from described small-cell base station receiving state report, comprising the RLC sequence number of packet causing loss by described air interface, described detection comprises described macro cell base station and reorders to described upstream data bag based on RLC sequence number, and determine whether described upstream data bag also exists any loss wherein except packet corresponding to the RLC sequence number comprised in described status report.
10. method as claimed in claim 9, exist between described macrocell and described small-cell and carry when splitting, described detection comprises described macro cell base station and to reorder to described upstream data bag based on GTP sequence number thus judge whether described upstream data bag has loss; And when described upstream data bag exist lose time, described macro cell base station determine to exist by described Xn interface cause congested, do not stop the slip of the receive window of described macro cell base station equivalent layer because of cause congested of described Xn interface.
11. methods as claimed in claim 9, when wherein still there is loss in described upstream data bag except the packet that the sequence number except comprising in described status report is corresponding, described macro cell base station determine to exist by described Xn interface cause congested, do not stop the slip of the receive window of described macro cell base station equivalent layer because of cause congested of described Xn interface.
12. 1 kinds for performing the base station equipment of the method described in aforementioned arbitrary claim.
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