CN102045787A - Downlink scheduling method, donor base station and relay node - Google Patents
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Abstract
The invention discloses a downlink scheduling method, a donor base station (DeNB) and a relay node (RN). For the downlink scheduling of each type of radio bearer (RB), the method comprises the following steps of: sending actual transmission result information of the RB on a Un interface to the RN by the DeNB; adjusting a quality of service (QoS) parameter of the RB on a Uu interface by the RN according to the actual transmission result information of the RB on the Un interface, which is sent by the DeNB, and the comprehensive QoS requirement of the RB, and scheduling the RB on the Uu interface according to the adjusted QoS parameter, wherein the comprehensive QoS requirement refers to the QoS requirement that the RB is transmitted to user equipment (UE) from the DeNB via the RN. The technical scheme of the invention can ensure the QoS requirement of business transmitted by the RN in the downlink scheduling process to the maximum extent.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a downlink scheduling method, a donor base station, and a relay node.
Background
After the Long Term Evolution (LTE) technology of 3GPP, the 3GPP organization continues to enhance the LTE scheme, which is called LTE-enhanced (LTE-a) technology.
In the LTE-a technology, a Relay Node (RN) is added to the architecture of an access network. The RN may be considered as an extension of an evolved base station (eNB), providing more economical coverage for the system. The RN is connected with the eNB through a wireless interface, and the RN can enhance the coverage quality at the edge of the coverage of the eNB and can also be deployed outside the coverage area of the eNB to expand the coverage range.
Fig. 1 is a schematic diagram of an RN in an existing LTE-a networking. As shown in fig. 1, an eNB providing a radio access service to an RN is referred to as a Donor base station (DeNB, Donor eNB); the RN and the DeNB are connected through a wireless Un interface, and the RN and User Equipment (UE) are connected through a Uu interface of LTE. One RN can carry a plurality of UEs, and when the DeNB schedules the RN for transmission through a Un interface, the RN takes the role of the UE, and when the RN schedules the UE carried by the RN for transmission through a Uu interface, the RN takes the role of the eNB.
Currently, according to the function that the RN can perform, the RN can be divided into three types: layer one RN, layer two RN and layer three RN. Both the layer two RN and the layer three RN may perform a scheduling function, that is, in the two relay system, one Radio Bearer (RB) needs to be transmitted through twice scheduling of the DeNB and the RN before reaching the receiving node UE. In the scheduling process of the first Un interface, the DeNB does not know the channel condition of the Uu interface, so that the service quality of service (QoS) requirement can only be applied to the Un interface for scheduling, when the RB reaches the RN and the Uu interface is scheduled for the second time, the QoS requirement of the service cannot be met again probably because the channel condition is not good, and finally the scheduling and sending processes of the two interfaces are integrated, and the QoS requirement of the RB cannot be met.
In the LTE system, the scheduler is located at the eNB, and bearer-level QoS parameters (including parameters such as transmission rate and delay) are proposed for a radio interface between the UE and the eNB, which are not changed in the current LTE-a system, which brings a problem of how to guarantee QoS of the same RB after two schedules for the same RB.
Fig. 2 is a diagram illustrating QoS guarantee in downlink scheduling in LTE-a. As shown in fig. 2, the width of the dashed tunnel represents the transmission rate requirement of an RB in the LTE system, the width of the solid tunnel represents the transmission rate requirement of an RB in the LTE-a system, and the distance between the dashed tunnel and the solid tunnel represents the delay requirement of the RB. It can be seen from fig. 2 that in the LTE-a system, the two scheduling processes of the two interfaces Un and Uu are completely processed according to the same QoS requirement for the RB in the LTE system. For example, if a transmission rate of one RB is 10kbps and a delay time is 5ms in the LTE system, the overall QoS requirement for the RB is as follows in the LTE-a system: the average transmission rate from the DeNB to the UE through the RN transit is 10kbps, and the delay is 5 ms.
At present, there are many scheduling algorithms, for example, a commonly used scheduling algorithm W-LWDF, the main idea of the algorithm is to balance and consider the delay of a packet data packet and how to effectively utilize channel information, the calculation of the user priority is related to not only the current channel quality of a user, but also the queue delay of a data packet, actually, the commonly used scheduling algorithms all strive to consider the above factors, and the difference is that the weights of the algorithms on the factors are considered differently. The problem shown in fig. 3 may occur when the existing scheduling algorithm is adopted to schedule RBs in the LTE-a system.
Fig. 3 is a diagram illustrating a problem of a scheme for scheduling RBs in LTE-a using a conventional scheduling algorithm. As shown in fig. 3, in the actual scheduling transmission process, data of an RB can only be scheduled at a small rate after waiting for a long time at a Un interface due to poor radio channel conditions, while at a Uu interface, since an RN as a receiving end cannot know the scheduling transmission condition of the RB at the Un interface, when the RN is used as a transmitting end to schedule a UE, the RN cannot negotiate a QoS requirement, and can only schedule the UE according to an initial QoS requirement, and the result of the RB at both the Un interface and the Uu interface is synthesized, which often cannot meet the QoS requirement of the RB.
The current LTE-a system does not support the QoS negotiation procedure, so only one value can be fixedly set in the schedulers of the DeNB and RN for each QoS parameter. But how to reasonably set the parameters of the schedulers on the DeNB and RN is a troublesome problem. Taking the delay parameter in the QoS parameters as an example, in the scheduling process of the Un interface and the Uu interface, if the tolerable maximum delay parameter of one RB is fixedly set to a larger value, it is inevitable that each interface can guarantee the delay requirement of the RB, but the possibility that the RB cannot guarantee the requirement occurs between the DeNB and the UE, that is, when the radio channel condition is poor, a more serious condition of service quality degradation will be brought. On the contrary, if the tolerable maximum delay parameter of the RB on the two interfaces is set to a smaller value, the priority of the RB is increased under the condition that the QCI values of the RBs are the same as those of the RBs, and the RB is not fair to other RBs. Similarly, there is a similar problem for the Guaranteed Bit Rate (GRB) of the bearer QoS parameter, that is, if the parameter related to the Rate requirement is set too low when the RN or UE is scheduled on two interfaces, then when the channel condition is poor, two sections of wireless links of the Un and Uu interfaces are integrated, and the Rate cannot meet the QoS requirement of the service; on the contrary, if the rate-related parameters are set too high when the two interfaces schedule the RN or the UE, the scheduling priority of the service is excessively increased, which is unfair to other RBs.
In summary, in the LTE-a system including the RN, the QoS requirement of the service transmitted by the RN is not guaranteed in the downlink scheduling process.
Disclosure of Invention
The invention discloses a downlink scheduling method which can furthest ensure the QoS requirement of a service transmitted by RN in the downlink scheduling process.
The invention also discloses a DeNB and an RN, which can furthest ensure the QoS requirement of the service transmitted by the RN in the downlink scheduling process.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention discloses a downlink scheduling method, which is applied to a long term evolution enhanced LTE-A system comprising a relay node RN, and comprises the following steps of:
the donor base station DeNB sends the actual transmission result information of the RB on the Un interface to the RN; the Un interface is an interface between the DeNB and the RN;
the RN adjusts Qo S parameters of the RB on the Uu interface according to actual transmission result information of the RB on the Un interface sent by the DeNB and the comprehensive QoS (quality of service) requirement of the RB, and schedules the RB on the Uu interface according to the adjusted QoS parameters; the Uu interface is an interface between the RN and the UE, and the comprehensive QoS requirement refers to a QoS requirement that the RB is transmitted from the DeNB to the UE through the RN.
The invention also discloses a DeNB, which comprises: an acquisition module and a distribution module, wherein,
the acquisition module is used for acquiring the actual transmission result information of each type of RB on the Un interface and sending the actual transmission result information to the sending module;
the down-sending module is used for receiving the actual transmission result information of the RB on the Un interface sent by the acquisition module and sending the actual transmission result information to the RN; the RN adjusts the QoS parameters of the RB on the Uu interface according to the received actual transmission result information of the RB on the Un interface and the comprehensive QoS requirement of the RB, and schedules the RB on the Uu interface according to the adjusted QoS parameters;
wherein the integrated QoS requirement refers to the QoS requirement of the RB transmitted from the DeNB to the UE through the RN.
The invention also discloses a RN, which comprises an adjusting module and a scheduling module, wherein,
the adjusting module is used for receiving the actual transmission result information of a type of RB of the DeNB on the Un interface, adjusting the QoS parameters of the type of RB on the Uu interface according to the received actual transmission result information and the comprehensive QoS parameters of the type of RB, and informing the scheduling module of the type of the RB and the adjusted QoS parameters; the comprehensive QoS requirement refers to the QoS requirement of the RB transmitted from the DeNB to the UE through the RN;
and the scheduling module is used for receiving the RB category and the adjusted QoS parameter sent by the adjusting module and scheduling the RB belonging to the received RB category on the Uu interface according to the received adjusted QoS parameter.
It can be seen that, in the downlink scheduling of each type of RB, the DeNB sends the actual transmission result information of the type of RB on the Un interface to the RN, and the RN adjusts the QoS parameters of the type of RB on the Uu interface according to the actual transmission result information of the type of RB on the Un interface sent by the DeNB and the comprehensive QoS requirement of the type of RB, and schedules the type of RB on the Uu interface according to the adjusted QoS parameters, so that the RN can correspondingly adjust the QoS parameters according to which the RB is scheduled on the Uu interface according to the actual transmission condition of the RB on the Un interface. For example, when the actual transmission condition of the class of RB on the Un interface is poor, the DeNB may increase the QoS requirement of the class of RB on the Uu interface, thereby increasing the scheduling priority of the class of RB on the Uu interface to make up for the QoS loss of the class of RB on the Un interface, and vice versa.
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Fig. 1 is a schematic diagram of an RN in an existing LTE-a networking;
FIG. 2 is a diagram illustrating QoS guarantee in LTE-A in the prior art;
FIG. 3 is a diagram illustrating the problem with a scheme for scheduling RBs in LTE-A using a conventional scheduling algorithm;
fig. 4 is a flowchart of a downlink scheduling method according to an embodiment of the present invention;
FIG. 5 is a graphical illustration of dynamically adjusting traffic QoS in an embodiment of the present invention;
fig. 6 is a block diagram of a DeNB according to an embodiment of the present invention;
fig. 7 is a block diagram of a composition structure of an RN according to an embodiment of the present invention.
Detailed Description
The core idea of the invention is as follows: and adding a negotiation mechanism to the RN, sending actual transmission result information of a certain type of RB on the Un interface to the RN, taking the actual transmission result information as a reference basis when the RN schedules the type of RB on the Uu interface, and dynamically adjusting the QoS requirement of the type of RB on the Uu interface, wherein the negotiation mechanism sends a negotiation message according to the type of the RB.
In the embodiment of the present invention, the reason why the negotiation mechanism sends the negotiation message according to the RB class is that RBs of the same class have the same QoS requirement.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Fig. 4 is a flowchart of a downlink scheduling method according to an embodiment of the present invention. As shown in fig. 4, for downlink scheduling of each type of RB in an LTE-a system including an RN, the method includes the following steps:
In this step, the actual transmission result information sent by the DeNB to the RN includes: the actual transmission delay of the RB on the Un interface, the actual transmission rate of the RB on the Un interface and the like.
In this step, the RN dynamically adjusts the QoS of the RB type on the Uu interface according to the actual transmission result information of the RB type on the Un interface and the comprehensive QoS requirement of the RB type. Taking the delay parameter as an example, when the actual transmission delay of the RB is 6ms on the Un interface and the comprehensive delay requirement of the RB is 10ms, the RN adjusts the transmission delay requirement of the RB on the Uu interface to 4ms, and schedules the RB according to the 4ms in the subsequent Uu interface scheduling process, so as to ensure that the delay of the RB transmitted from the DeNB to the UE through the RN is 10ms after the RB is scheduled twice through the Un interface and the Uu interface as much as possible. The adjustment of other QoS parameters, such as transmission rate, etc., can be analogized, and are not described one by one here.
In the embodiment of the invention, the method for transmitting the actual transmission result information of the RB on the Un interface to the RN by the DeNB is divided into periodic transmission and event trigger transmission. Periodically sending, namely sending updated actual transmission result information again after a preset time period passes after each type of RB sends the actual transmission result information last time; the event trigger transmission is to trigger the DeNB to transmit updated actual transmission result information when one RB is transmitted between the DeNB and the RN, that is, when one RB belonging to a certain class is transmitted between the DeNB and the RN, the DeNB transmits the actual transmission result information of the RB on the Un interface to the RN.
In the embodiment of the invention, the DeNB sends the actual transmission result information of a certain type of RB on the Un interface to the RN through the downlink control channel. The DeNB can independently send the actual transmission result information of the RB on the Un interface to the RN through a downlink control channel; or, the DeNB may also send the actual transmission result information of the RB on the Un interface of this type, together with other control information, to the RN through the downlink control channel. Here, the other control information includes information such as ACK/NACK and CQI.
Fig. 5 is a schematic diagram of dynamically adjusting the QoS of the service in the embodiment of the present invention. As shown in fig. 5, the DeNB sends QoS negotiation information, that is, actual transmission result information of a type of RB on the Un interface to the RN, and the RN adjusts the QoS requirement for downlink scheduling of the type of RB on the Uu interface next time according to the comprehensive QoS requirement of the type of RB and the actual transmission result information on the Un interface, and uses the QoS requirement as an input parameter in the scheduling process, thereby completing the scheduling process of the Uu interface. As shown in fig. 5, if the transmission rate of the class RB on the Un interface is small (the width of the tunnel is narrow) and the time is long (the distance from the dashed tunnel is long), the qos on the Uu interface is relatively adjusted, so that the transmission rate of the class RB on the Uu interface is large (the width of the tunnel is wide), the time delay is small (the distance from the dashed tunnel is short), and vice versa.
In the embodiment of the present invention, since the DeNB cannot know the actual transmission result information of the Uu interface, such as the rate and the time delay of the RB, the DeNB still uses the preset initial Un interface QoS parameters when the Un interface is scheduled. Although the service data of the Un interface has the requirement that the QoS of the service cannot be met due to the poor wireless channel condition, the technical scheme of the invention ensures the QoS requirement of the service to the maximum extent by combining the transmission process from the DeNB to the UE.
The following provides a composition structure of a DeNB and an RN in the present invention based on the above-described embodiments.
Fig. 6 is a block diagram of a DeNB according to an embodiment of the present invention. As shown in fig. 6, the DeNB includes: an obtaining module 601 and an issuing module 602, wherein:
an obtaining module 601, configured to obtain, for each type of RB, actual transmission result information of the type of RB on the Un interface, and send the actual transmission result information to the issuing module 602;
the issuing module 602 is configured to receive actual transmission result information of the RB on the Un interface sent by the obtaining module 601, and send the actual transmission result information to the RN; the RN adjusts the QoS parameters of the RB on the Uu interface according to the received actual transmission result information of the RB on the Un interface and the comprehensive QoS requirement of the RB, and schedules the RB on the Uu interface according to the adjusted QoS parameters;
wherein the integrated QoS requirement refers to the QoS requirement of the RB transmitted from the DeNB to the UE through the RN.
The obtaining module 601 shown in fig. 6 is configured to obtain actual transmission result information of the RB of this type on the Un interface, and periodically send the actual transmission result information to the issuing module 602; the issuing module 602 is configured to receive the actual transmission result information periodically sent by the acquiring module, and periodically send the actual transmission result information to the RN;
or,
the acquiring module 601 is configured to acquire actual transmission result information of an RB on the Un interface when the RB belonging to the category is completely transmitted between the DeNB and the RN, and send the actual transmission result information to the sending module.
The issuing module 602 shown in fig. 6 is configured to send the actual transmission result information from the obtaining module 601 to the RN through a downlink control channel.
As shown in fig. 6, the sending module 602 sends the actual transmission result information from the obtaining module 601 to the RN through a downlink control channel; or, the sending module 602 sends the actual transmission result information from the obtaining module 601 and other control information to the RN through a downlink control channel.
Fig. 7 is a block diagram of a composition structure of an RN according to an embodiment of the present invention. As shown in fig. 7, the RN includes an adjusting module 701 and a scheduling module 702, wherein:
an adjusting module 701, configured to receive actual transmission result information of a type of RB of the DeNB on the Un interface, adjust QoS parameters of the type of RB on the Uu interface according to the received actual transmission result information and the comprehensive QoS parameters of the type of RB, and notify the scheduling module 702 of the type of RB and the adjusted QoS parameters; the comprehensive QoS requirement refers to the QoS requirement of the RB transmitted from the DeNB to the UE through the RN;
a scheduling module 702, configured to receive the RB class and the adjusted QoS parameter sent by the adjusting module 701, and schedule an RB belonging to the received RB class on the Uu interface according to the received adjusted QoS parameter.
In summary, in the downlink scheduling of each type of RB, the DeNB sends the actual transmission result information of the type of RB on the Un interface to the RN, and the RN adjusts the QoS parameter of the type of RB on the Uu interface according to the actual transmission result information of the type of RB on the Un interface sent by the DeNB and the comprehensive QoS requirement of the type of RB, and schedules the type of RB on the Uu interface according to the adjusted QoS parameter, so that the RN can correspondingly adjust the QoS parameter according to which the RB is scheduled on the Uu interface according to the actual transmission condition of the RB on the Un interface. For example, when the actual transmission condition of the class of RB on the Un interface is poor, the DeNB may increase the QoS requirement of the class of RB on the Uu interface, thereby increasing the scheduling priority of the class of RB on the Uu interface to make up for the QoS loss of the class of RB on the Un interface, and vice versa. Therefore, the technical scheme of the invention ensures the QoS of the service transmitted by the UE carried by the RN in the downlink scheduling process to the maximum extent, and simultaneously reduces the occupation of the service transmitted by the RN on the resources required by the similar service directly carried by the DeNB for UE transmission, namely, the QoS requirement and fairness of the service are considered.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A downlink scheduling method is applied to a long term evolution enhanced LTE-A system comprising a Relay Node (RN), and is characterized in that for downlink scheduling of each type of Radio Bearer (RB), the method comprises the following steps:
the donor base station DeNB sends the actual transmission result information of the RB on the Un interface to the RN; the Un interface is an interface between the DeNB and the RN;
the RN adjusts the QoS parameters of the RB on the Uu interface according to the actual transmission result information of the RB on the Un interface sent by the DeNB and the comprehensive QoS requirement of the RB, and schedules the RB on the Uu interface according to the adjusted QoS parameters; the Uu interface is an interface between the RN and the UE, and the comprehensive QoS requirement refers to a QoS requirement that the RB is transmitted from the DeNB to the UE through the RN.
2. The method of claim 1, wherein the DeNB sending information of an actual transmission result of the RB of the type on the Un interface to the RN comprises:
the DeNB periodically sends the actual transmission result information of the RB on the Un interface to the RN;
or,
and when one RB belonging to the class is completely transmitted between the DeNB and the RN, the DeNB sends the actual transmission result information of the RB on the Un interface to the RN.
3. The method of claim 1, wherein the DeNB sending information of an actual transmission result of the RB of the type on the Un interface to the RN comprises:
and the DeNB sends the actual transmission result information of the RB on the Un interface to the RN through a downlink control channel.
4. The method of claim 3, wherein the sending, by the DeNB, the actual transmission result information of the RB on the Un interface to the RN through the downlink control channel comprises:
the DeNB independently sends the actual transmission result information of the RB on the Un interface to the RN through a downlink control channel;
or,
and the DeNB sends the actual transmission result information of the RB on the Un interface together with other control information to the RN through a downlink control channel.
5. The method according to any one of claims 1 to 4, characterized in that the method further comprises:
and the DeNB schedules the RB on the Un interface according to the preset initial Un interface QoS parameters.
6. A DeNB, comprising: an acquisition module and a distribution module, wherein,
the acquisition module is used for acquiring the actual transmission result information of each type of RB on the Un interface and sending the actual transmission result information to the sending module;
the down-sending module is used for receiving the actual transmission result information of the RB on the Un interface sent by the acquisition module and sending the actual transmission result information to the RN; the RN adjusts the QoS parameters of the RB on the Uu interface according to the received actual transmission result information of the RB on the Un interface and the comprehensive QoS requirement of the RB, and schedules the RB on the Uu interface according to the adjusted QoS parameters;
wherein the integrated QoS requirement refers to the QoS requirement of the RB transmitted from the DeNB to the UE through the RN.
7. The DeNB of claim 6,
the acquisition module is used for acquiring the actual transmission result information of the RB on the Un interface and periodically sending the actual transmission result information to the issuing module; the sending module is used for receiving the actual transmission result information periodically sent by the acquisition module and periodically sending the actual transmission result information to the RN;
or,
the acquiring module is configured to acquire actual transmission result information of an RB on the Un interface when the RB belonging to the category is completely transmitted between the DeNB and the RN, and send the actual transmission result information to the issuing module.
8. The DeNB of claim 6,
and the issuing module is used for sending the actual transmission result information from the acquiring module to the RN through a downlink control channel.
9. The DeNB of claim 8,
the sending module is used for independently sending the actual transmission result information from the acquisition module to the RN through a downlink control channel;
or,
and the issuing module is used for sending the actual transmission result information from the acquisition module and other control information to the RN through a downlink control channel.
10. An RN, comprising an adjustment module and a scheduling module, wherein,
the adjusting module is used for receiving the actual transmission result information of a type of RB of the DeNB on the Un interface, adjusting the QoS parameters of the type of RB on the Uu interface according to the received actual transmission result information and the comprehensive QoS parameters of the type of RB, and informing the scheduling module of the type of RB and the adjusted Qo S parameters; the comprehensive QoS requirement refers to a Qo S requirement transmitted to the UE from the DeNB through the RN;
and the scheduling module is used for receiving the RB category and the adjusted QoS parameter sent by the adjusting module and scheduling the RB belonging to the received RB category on the Uu interface according to the received adjusted QoS parameter.
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