CN103916967B - Disturbance coordination method and device between via node - Google Patents
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Abstract
The invention discloses the interference coordination schemes between RN：When needing to send data to each RN of subordinate, DeNB determines that each RN has sent the access link number of resources needed for the data received respectively, and according to the at utmost orthogonal principle of the access link resources for determining to be distributed between result and each RN, access link resources are distributed for each RN, each RN utilizes distributed access link resources that the data received are sent into each RUE of subordinate；Or, for any RN, when receiving the data that DeNB is sent, it is determined that the access link number of resources needed for the data received is sent, and according to determination result, required access link resources are randomly selected from access link resources, the data received are sent to each RUE of subordinate using the access link resources selected.Using scheme of the present invention, it is possible to increase the performance of terminal.
Description
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a method and an apparatus for interference coordination between relay nodes.
Background
In order to cope with various complicated radio propagation environments and the like, a Relay Node (RN) is introduced into an enhanced long term Evolution (LTE-a) system.
The functions of the RN mainly include: in some scenes that optical fibers cannot reach or wired return construction is difficult, coverage can be effectively expanded by introducing the RN with the wireless return function; in addition, by introducing the RN, shadow coverage areas and even dead zones generated by tall building groups can be eliminated.
By adding the RN between a donor evolved base station (DeNB) and a terminal (UE), a direct transmission link between the DeNB and the UE can be divided into two sections: a backhaul link (backhaul) and an access link (access link). Wherein, backhaul link refers to a wireless link between the DeNB and the RN, and access link refers to a wireless link between the RN and the UE.
FIG. 1 is a schematic diagram of a conventional backhaul link and access link. By reasonably deploying the RN, the two divided links can have shorter propagation distance than the direct transmission link, and meanwhile, the shielding objects and the like in the propagation route can be reduced, so that the two divided links have better wireless propagation conditions and better transmission capability than the direct transmission link.
In general, RNs can be divided into in-band RNs (Inband RNs) and out-of-band RNs (Outband RNs). Backhaul link and access link of the in-band RN are transmitted in the same frequency band resource and are subjected to time division multiplexing; backhaul and accesslink of the out-of-band RN are transmitted in different frequency bands and are subjected to frequency division multiplexing.
In addition, the UE may be classified into a Macro terminal (MUE, Macro UE) and a Relay terminal (RUE, Relay UE) according to the connected objects. MUE refers to UE connected to DeNB, RUE refers to UE connected to RN.
In the LTE-a system, the RN used is mainly a Type 1RN (Type-1RN), and such RN has its own independent Cell identity (Cell ID), which is equivalent to an independent Cell, and can perform layer 3 processing. For an in-band RN in the type 1RN, namely the type 1 in-band RN, receiving data from the DeNB through a backhaul link subframe, and transmitting the received data to each subordinate RUE through an access link subframe, wherein the RN is in a receiving state and does not transmit data on the backhaul link subframe, and the RN is in a transmitting state and does not receive data on the access link subframe, namely the backhaul link subframe and the access link subframe of the RN are orthogonal time division.
However, in practical applications, there are problems in that:
fig. 2 is a diagram illustrating interference experienced by different UEs in the prior art; as shown in fig. 2, RN1 and RN2 are two 1-type in-band RNs under the same DeNB, RN1 and RN2 receive data transmitted by the DeNB in backhaul link subframes 0 to 3, and simultaneously transmit data to each ue under the DeNB in access link subframes 4 to 7 (assuming that data transmission can be completed without using access link subframes 8 to 9), because of interference between RNs, an ue under RN1 (especially when it is at the cell edge) is severely interfered by RN2, and an ue under RN2 is also severely interfered by RN1, thereby reducing the performance of the ue; in addition, on backhaul link subframes 0-3, the receivers of RN1 and RN2 operate, receive data from the DeNB, and the transmitter is silent, so that interference to MUEs under the DeNB is not generated, but on access link subframes 4-7, the transmitters of RN1 and RN2 operate, interference to MUEs is generated, and performance of MUEs is reduced.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for coordinating interference between relay nodes, which can improve the performance of a terminal.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an inter-RN interference coordination method is suitable for 1-type in-band RN;
when data needs to be transmitted to each subordinate RN, the DeNB performs the following processing:
respectively determining the number of access link resources required by each RN after sending the data received from the DeNB;
and allocating access link resources for the RNs respectively according to the determination result and the principle that the allocated access link resources among the RNs are orthogonal to the maximum extent, so that the RNs can transmit the data received from the DeNB to the subordinate RUEs by using the allocated access link resources.
An inter-RN interference coordination method is suitable for 1-type in-band RN;
for any RN, when data transmitted by the DeNB is received, the following processing is carried out:
determining the number of access link resources required for sending the data received from the DeNB;
and randomly selecting required access link resources from the access link resources according to the determination result, and transmitting the data received from the DeNB to each subordinate RUE by using the selected access link resources.
A DeNB, comprising:
the first processing module is used for informing the second processing module to execute the self-function when the DeNB is determined to need to send data to each subordinate RN, and each RN is a type 1 in-band RN;
the second processing module is configured to determine the number of access link resources required for each RN to finish sending and receiving data from the DeNB; and allocating access link resources for the RNs respectively according to the determination result and the principle that the allocated access link resources among the RNs are orthogonal to the maximum extent, so that the RNs can transmit the data received from the DeNB to the subordinate RUEs by using the allocated access link resources.
An RN, the RN being a 1-type in-band RN, comprising:
the third processing module is used for informing the fourth processing module to execute the self-function when receiving the data sent by the DeNB, and sending the received data to the fourth processing module;
the fourth processing module is configured to determine the number of access link resources required for sending the received data; and according to the determination result, randomly selecting required access link resources from the access link resources, and transmitting the received data to each subordinate RUE by using the selected access link resources.
In the scheme of the invention, two interference coordination modes between RNs are provided, wherein in one mode, the interference of a certain RN to RUEs subordinate to other RNs is reduced as much as possible by enabling access link resources distributed by each RN to be orthogonal to the maximum extent; in another mode, each RN may randomly select its own required access link resource, and since the probability that the access link resources selected by each RN are completely the same is small, that is, the access link resources selected by each RN usually have a certain degree of orthogonality, the interference received by the RUE and the MUE may also be reduced; in either way, the performance of the RUE and MUE can be improved.
Drawings
FIG. 1 is a schematic diagram of a conventional backhaul link and access link.
Fig. 2 is a diagram illustrating interference experienced by different UEs in the prior art.
Fig. 3 is a flowchart illustrating a method for inter-RN interference coordination according to a first embodiment of the present invention.
Fig. 4 is a flowchart illustrating a method for inter-RN interference coordination according to a second embodiment of the present invention.
Detailed Description
Aiming at the problems in the prior art, the invention provides an interference coordination scheme among RNs, which can improve the performance of a terminal and is mainly suitable for type 1 in-band RNs.
In order to make the technical solution of the present invention clearer and more obvious, the solution of the present invention is further described in detail below by referring to the drawings and examples.
Fig. 3 is a flowchart illustrating a method for inter-RN interference coordination according to a first embodiment of the present invention. When data needs to be sent to each subordinate RN each time, the DeNB may perform processing according to the flow shown in fig. 3. As shown in fig. 3, includes:
step 31: the DeNB respectively determines the number of access link resources required by each RN for transmitting the data received from the DeNB.
Step 32: and the DeNB allocates the access link resources for the RNs respectively according to the determination result and the principle that the allocated access link resources among the RNs are orthogonal to the maximum extent, and can inform the RNs so that the RNs can transmit the data received from the DeNB to the subordinate RUEs by using the allocated access link resources.
In this step, the DeNB may notify each RN of the access link resource allocated to each RN, and accordingly, each RN may transmit data received from the DeNB to each subordinate RUE using the allocated access link resource.
In practical application, the flow shown in fig. 3 may have two different specific implementation manners, which are respectively: the time domain interference coordination method and the frequency domain interference coordination method are respectively introduced as follows.
1) Time domain interference coordination mode
Corresponding to this manner, the specific implementation of step 31 may be:
for each RN, the DeNB respectively determines the number of access link resources required by the RN for transmitting the data received from the DeNB in the following modes:
calculating the number of access link subframes N1 required by the RN to finish sending the data received from the DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN in one Resource Block (RB), NRBRepresenting the total number of RBs within the system bandwidth.
How the DeNB acquires K, Tk、NRBThe isoparametric is prior art. In addition, each RN may report the average spectral efficiency of its subordinate RUEs to the DeNB periodically, and when a certain RN needs to be calculated according to formula (1), the DeNB may use the average spectral efficiency of the latest reported subordinate RUEs of the RN to calculate the average transmission rate DR of the RN subordinate RUEs in one RBkIf the calculation is performed, it is prior art.
Corresponding to this manner, the specific implementation of step 32 may be:
the DeNB allocates access link subframes with the same number as the corresponding calculation results for each RN respectively, and enables the allocated access link subframes among the RNs to be orthogonal to the maximum extent; then, each RN is notified of the accesslink resource allocated to each RN, and accordingly, each RN transmits data received from the DeNB to each subordinate RUE using the allocated access link resource.
Wherein, the maximum orthogonality of the access link subframes allocated among RNs means that: if the access link subframes allocated among RNs can be completely orthogonal, allocating the access link subframes in a manner of completely orthogonal; if the access link subframes allocated among RNs cannot be completely orthogonal, the access link subframes allocated among RNs are allocated in a manner that the access link subframes allocated among RNs are completely orthogonal as many as possible and the other RNs are partially orthogonal to the greatest extent.
For example, the following steps are carried out:
referring to fig. 2, DeNB belongs to two RNs, RN1 and RN 2; calculating that the number of access link subframes required by the RN1 to send the data received from the DeNB is 2, and the number of access link subframes required by the RN2 to send the data received from the DeNB is 2, so that the access link subframes 4-5 can be allocated to the RN1, and the access link subframes 6-7 can be allocated to the RN2, so that the access link subframes allocated by the two RNs are completely orthogonal; or, the number of access link subframes required by RN1 to send data received from the DeNB is calculated to be 3, and the number of access link subframes required by RN2 to send data received from the DeNB is calculated to be 4, then access link subframes 4-6 can be allocated to RN1, and access link subframes 6-9 can be allocated to RN2, so that the allocated access link subframes of two RNs are as few as possible (only one repetition).
Assuming that the RN1 and the RN2 need to use the access link subframes 4 to 7 respectively to transmit the data received from the DeNB in the conventional manner, and after the time domain interference coordination manner is adopted, because the performance of the terminal is improved, assuming that the RN1 and the RN2 need only use two access link subframes to transmit the data received from the DeNB, if the RN1 needs only to use the access link subframes 4 to 5 to transmit the data received from the DeNB, the RN2 needs only to use the access link subframes 6 to 7 to transmit the data received from the DeNB.
Accordingly, after the time domain interference coordination mode is adopted, the following advantages can be brought: the number of the accesslink subframes used by the RN is reduced from four to two, so that the working time of a transmitter of the RN is reduced, and the RN can effectively save energy; although the MUE still receives interference from the RN on the access link subframes 4-7, the number of RN interference sources at each moment is reduced from two to one, so that the interference from the RN received by the MUE is reduced, and the performance of the MUE is improved; the performance of the RUE is improved due to reduced interference between RNs; the performance includes throughput and power consumption, etc.
2) Frequency domain interference coordination mode
Corresponding to this manner, the specific implementation of step 31 may be:
for each RN, the DeNB respectively determines the number of access link resources required by the RN for transmitting the data received from the DeNB in the following modes:
calculating the number of RBs N2 required by the RN to finish transmitting the data received from the DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one RB, NASFIndicating the access link subframe number within a radio frame.
How DeNB acquires NASFThe parameters are also prior art.
Corresponding to this manner, the specific implementation of step 32 may be:
the DeNB allocates RBs with the same number as the corresponding calculation results for the RNs respectively, and enables the RBs allocated among the RNs to be orthogonal to the maximum extent; then, each RN is notified of the access link resource allocated to each RN, and accordingly, each RN transmits data received from the DeNB to each subordinate RUE using the allocated access link resource.
For example, the following steps are carried out:
referring to fig. 2, DeNB belongs to two RNs, RN1 and RN2, respectively, and assumes that the total number of RBs within the system bandwidth is 50; the number of RBs required by RN1 to transmit data received from the DeNB is calculated to be 20, and the number of RBs required by RN2 to transmit data received from the DeNB is also calculated to be 20, so that RBs 1-20 can be allocated to RN1, and RBs 21-RB 40 can be allocated to RN2, so that the RBs allocated by the two RNs are completely orthogonal; alternatively, if the number of RBs required for RN1 to transmit data completely received from the DeNB is calculated to be 25 and the number of RBs required for RN2 to transmit data completely received from the DeNB is calculated to be 27, then RBs 1 to RB25 may be allocated to RN1 and RBs 24 to RB50 may be allocated to RN2, so that the RBs allocated by the two RNs are repeated as little as possible.
Assuming that RN1 and RN2 need to use access link subframes 4 to 7 respectively and use all 50 RBs to transmit data received from the DeNB completely according to the existing manner, and after the frequency domain interference coordination manner is adopted, RN1 and RN2 use access link subframes 4 to 9 to transmit data, but since the performance of the terminal is improved, each RN only needs to use 20 RBs to transmit data received from the DeNB completely, for example, RN1 only needs to use RBs 1 to RB20 to transmit data received from the DeNB completely, and RN2 only needs to use RBs 21 to RB40 to transmit data received from the DeNB completely.
Accordingly, the frequency domain interference coordination method can bring the following advantages: if the MUE is interfered by two RNs simultaneously according to the existing mode, after the frequency domain interference coordination mode is adopted, the MUE is interfered by only one RN on average, so that the interference from the RNs to the MUE is reduced, and the performance of the MUE is improved; the performance of the RUE is improved because interference between RNs is reduced.
This completes the description of two different specific implementations of the flow shown in fig. 3.
In addition, with respect to the flow shown in fig. 3, the following optimization processing may be further performed:
A. for any RN, if the RN determines that the RN continues for M1 times, after receiving the data transmitted by the DeNB each time, the RN does not transmit the received data on the allocated access link resource, and when receiving the data transmitted by the DeNB again after the continuous M1 times, the RN increases the allocated access link resource for the current data transmission, and transmits the data received from the DeNB to the subordinate RUEs by using the increased access link resource.
For any RN, if M2 times are determined continuously, after data sent by the DeNB is received each time, the received data are sent on the allocated access link resources, when the data sent by the DeNB is received again after the M2 times continuously, the received access link resources allocated by the DeNB for the data sending are reduced, and the data received from the DeNB are sent to subordinate RUEs by using the reduced access link resources;
wherein, M1 and M2 are both positive integers greater than 1, and the values of M1 and M2 may be the same or different, and the specific values may be determined according to actual needs. In addition, the specific amount of increase or decrease of the access link resource can be determined according to actual needs.
For example, the following steps are carried out:
assuming that the value of M1 is 3, if an RN, such as RN1, continues for 3 times, and after receiving data sent by a DeNB each time, the RN does not transmit the received data on the allocated access link resource, and when receiving data sent by the DeNB again after 3 times continuously, if the received DeNB allocates access link subframes for the data transmission at this time to be access link subframes 4 to 5, when performing actual data transmission, the RN may use access link subframes 4 to 6, that is, the number of access link subframes is increased by 1 compared to the allocated access link subframe number; in addition, the data which is not transmitted at the time can be transmitted together with the data to be transmitted next time;
assuming that the value of M2 is 4, RN1 continues for 4 times, and after receiving data sent by the DeNB each time, the received data is sent on the allocated access link resource, and when receiving data sent by the DeNB again after 4 times continuously, if the received access link subframe allocated by the DeNB for this data transmission is access link subframes 4-5, when performing actual data transmission, only access link subframe 4 may be used, that is, the number of access link subframes is reduced by 1 compared to the allocated access link subframe.
B) When the number of subordinate RNs is too many and the orthogonality condition of the access link resources distributed among the RNs cannot meet the preset requirement, the DeNB groups the RNs, and the distance between the RNs in each group needs to be larger than a preset threshold value; distributing the same access link resource for each RN in the same group, and distributing the access link resource for the RNs in each group according to the principle that the allocated access link resources among different groups are orthogonal to each other to the greatest extent; the specific value of the threshold can be determined according to actual needs.
For example, the following steps are carried out:
assuming that DeNB belongs to 4 RNs, namely RN1, RN2, RN3 and RN4, wherein RN1 and RN2 are far away from each other and generate little interference with each other, RN3 and RN4 are also far away from each other and generate little interference with each other, RN1 and RN2 can be divided into a group, RN3 and RN4 can be divided into a group, the same access link resource can be allocated to RN1 and RN2, the same access link resource can be allocated to RN3 and RN4, and the access link resource allocated to RN1 and RN2 is orthogonal to the access link resource allocated to RN3 and RN 4.
Fig. 4 is a flowchart illustrating a method for inter-RN interference coordination according to a second embodiment of the present invention. For any RN, when data transmitted by the DeNB is received each time, the processing may be performed according to the flow shown in fig. 4. As shown in fig. 4, includes:
step 41: the RN determines the number of access link resources required to transmit the data received from the DeNB.
Step 42: and the RN randomly selects required access link resources from the access link resources according to the determination result, and transmits the data received from the DeNB to each subordinate RUE by using the selected access link resources.
In practical application, the flow shown in fig. 4 may have two different specific implementation manners, which are respectively: the time domain interference coordination method and the frequency domain interference coordination method are respectively introduced as follows.
1) Time domain interference coordination mode
Corresponding to this manner, the specific implementation of step 41 may be:
the RN may determine the number of access link resources required to transmit the data received from the DeNB in the following manner:
calculating the number of access link subframes N3 required for transmitting the data received from the DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one RB, NRBRepresenting the total number of RBs within the system bandwidth.
Corresponding to this manner, the specific implementation of step 42 may be:
and the RN randomly selects N3 access link subframes from the access link subframe set as required access link resources according to the calculation result, and transmits the data received from the DeNB to each subordinate RUE by using the selected access link resources.
For example, the following steps are carried out:
referring to fig. 2, assuming that N3 calculated according to equation (3) is 2, RN may select one access link subframe, such as access link subframe 4, as a starting point, and use two consecutive access link subframes, i.e., access link subframes 4-5, as required access link resources.
After the time domain interference coordination mode is adopted, because each RN can randomly select the required access link resource, and the probability that the access link resources selected by each RN are completely the same is low, namely, the access link resources selected by each RN are generally orthogonal to a certain degree, the interference on MUE and RUE can be reduced, and the performance of the MUE and the RUE is improved.
2) Frequency domain interference coordination mode
Corresponding to this manner, the specific implementation of step 41 may be:
the RN may determine the number of access link resources required to transmit the data received from the DeNB in the following manner:
number of RBs N4 required to complete transmission of data received from DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one RB, NASFIndicating the access link subframe number within a radio frame.
Corresponding to this manner, the specific implementation of step 42 may be:
and the RN randomly selects N4 RBs from the RBs in the system bandwidth as required accesslink resources according to the calculation result, and transmits the data received from the DeNB to each subordinate RUE by using the selected access link resources.
For example, the following steps are carried out:
referring to fig. 2, assuming that N4 calculated according to formula (4) is 20, RN may select an RB such as RB21 as a starting point, and use 20 consecutive RBs, i.e., RB21 to RB40, as the required access link resource.
After the frequency domain interference coordination mode is adopted, because each RN can randomly select the required access link resource, and the probability that the access link resources selected by each RN are completely the same is low, namely, the access link resources selected by each RN are generally orthogonal to a certain degree, the interference on MUE and RUE can be reduced, and the performance of the MUE and the RUE can be improved.
This completes the description of two different specific implementations of the flow shown in fig. 4.
In addition, for the flow shown in fig. 4, in practical application, the following optimization processing may be further performed:
and if the RN determines that the data are transmitted for continuous M1 times, after the data transmitted by the DeNB are received each time, the received data are not transmitted on the selected accesslink resource, when the data transmitted by the DeNB are received again after the continuous M1 times, the selected access link resource for the data transmission is increased, and the data received from the DeNB are transmitted to each subordinate RUE by using the increased accesslink resource.
If the RN determines that the data are sent for continuous M2 times, after the data sent by the DeNB are received each time, the received data are sent on the selected accesslink resource, when the data sent by the DeNB are received again after the continuous M2 times, the selected access link resource for the data sending is reduced, and the data received from the DeNB are sent to each subordinate RUE by using the reduced accesslink resource.
It should be noted that, whether the DeNB allocates the access link resource to the RN in the manner shown in fig. 3 or the RN selects the access link resource by itself in the manner shown in fig. 4, the idea of pre-estimation is based on, and in practical applications, the estimated result can be flexibly adjusted according to the actual situation, and is not limited to the adjustment manners such as increasing or decreasing, and when to increase and decrease is not limited to the above.
This completes the description of the method embodiment of the present invention.
Based on the above description, the present invention provides a DeNB embodiment and an RN embodiment at the same time.
The DeNB comprises the following embodiments:
the first processing module is used for informing the second processing module to execute the self-function when the DeNB is determined to need to send data to each subordinate RN;
a second processing module, configured to determine the number of access link resources required for each RN to finish sending data received from the DeNB, respectively; and allocating the access link resources for the RNs respectively according to the determination result and the principle that the allocated access link resources among the RNs are orthogonal to the maximum extent, and informing the RNs so that the RNs can transmit the data received from the DeNB to the subordinate RUEs by using the allocated access link resources.
Wherein,
for each RN, the second processing module calculates the number N1 of accesslink subframes required by the RN to finish sending data received from the DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one RB, NRBRepresenting the total number of RBs within the system bandwidth;
correspondingly, the second processing module allocates the same number of accesslink subframes to each RN as the corresponding calculation result, and makes the allocated access link subframes orthogonal to each RN to the maximum extent.
Or,
for each RN, the second processing module respectively calculates the number of RBs N2 required by the RN to finish transmitting data received from the DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one RB, NASFRepresenting the number of access link subframes within a radio frame;
correspondingly, the second processing module allocates the same number of RBs for each RN as the corresponding calculation result, and enables the allocated RBs among the RNs to be orthogonal to the maximum extent.
The second processing module may be further configured to group RNs, where distances between RNs in each group need to be greater than a predetermined threshold; distributing the same access link resource for each RN in the same group, and distributing the access link resource for the RNs in each group according to the principle that the access link resources distributed among different groups are orthogonal to each other to the greatest extent; in general, the second processing module may perform this processing when the number of the subordinate RNs in the DeNB is too large and the orthogonality of the access link resources allocated among the RNs cannot meet a predetermined requirement, but may perform this processing if needed in other cases.
The RN embodiment comprises the following steps:
the third processing module is used for informing the fourth processing module to execute the self-function when receiving the data sent by the DeNB, and sending the received data to the fourth processing module;
the fourth processing module is used for determining the number of access link resources required by the received data after being sent; and according to the determination result, randomly selecting required access link resources from the access link resources, and transmitting the received data to each subordinate RUE by using the selected access link resources.
Wherein,
the fourth processing module calculates the number of access link subframes N3 required for sending the received data:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkTo representAmount of data DR that the RN wants to transmit to the kth RUE among the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one RB, NRBRepresenting the total number of RBs within the system bandwidth;
accordingly, the fourth processing module randomly selects N3 access link sub-frames from the set of access link sub-frames as the required access link resources.
Or,
the fourth processing module calculates the number of RBs N4 required for completing transmission of data received from the DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one RB, NASFRepresenting the number of access link subframes within a radio frame;
accordingly, the fourth processing module randomly selects N4 RBs from the RBs within the system bandwidth as the required accesslink resource.
The fourth processing module may be further configured to,
if the continuous M1 times is determined, after the data sent by the DeNB is received each time, the received data is not sent on the selected access link resource, when the data sent by the DeNB is received again after the continuous M1 times, the selected access link resource for the data sending at this time is increased, and the data received from the DeNB is sent to each subordinate RUE by using the increased access link resource;
if the data sent by the DeNB is determined to be sent for 2 times continuously, after the data sent by the DeNB is received each time, the received data is sent on the selected access link resource, when the data sent by the DeNB is received again after 2 times continuously, the selected access link resource for the data sending is reduced, and the data received from the DeNB is sent to each subordinate RUE by utilizing the reduced access link resource;
m1 and M2 are both positive integers greater than 1.
For the specific work flow of the above device embodiment, please refer to the corresponding description in the above method embodiment, which is not described herein again.
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 (9)
1. A method for coordinating interference between Relay Nodes (RNs) is characterized in that the method is suitable for type 1 in-band RNs;
when data needs to be sent to each subordinate RN, the host evolved node B DeNB performs the following processing:
respectively determining the number of access link resources required by each RN after sending the data received from the DeNB;
allocating access link resources for the RNs respectively according to the determination result and the principle that the allocated access link resources among the RNs are orthogonal to the maximum extent, so that the RNs can transmit the data received from the DeNB to subordinate relay terminals RUE by using the allocated access link resources;
wherein the determining the number of access link resources required for each RN to finish transmitting the data received from the DeNB includes:
for each RN, respectively calculating the number N1 of access link subframes required by the RN to finish sending the data received from the DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one resource block RB, NRBRepresenting the total number of RBs within the system bandwidth;
the allocating the access link resources for the RNs respectively according to the determination result and the principle that the access link resources allocated among the RNs are orthogonal to the maximum extent comprises:
allocating access link subframes with the same number as the corresponding calculation results for each RN respectively, and enabling the allocated access link subframes among the RNs to be orthogonal to the maximum extent;
or, the determining the number of access link resources required for each RN to finish transmitting the data received from the DeNB includes:
for each RN, respectively calculating the number N2 of RBs required by the RN for transmitting the data received from the DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one RB, NASFRepresenting the number of access link subframes within a radio frame;
the allocating the access link resources for the RNs respectively according to the determination result and the principle that the access link resources allocated among the RNs are orthogonal to the maximum extent comprises:
and allocating the RBs with the same number as the corresponding calculation results for each RN respectively, and enabling the allocated RBs among the RNs to be orthogonal to the maximum extent.
2. The method of claim 1, further comprising:
for any RN, if the RN determines that the RN is transmitted for M1 times continuously, after receiving data transmitted by the DeNB each time, the RN does not transmit the received data on the allocated access link resource, when receiving the data transmitted by the DeNB again after the DeNB is transmitted for M1 times continuously, increasing the received access link resource allocated by the DeNB for the data transmission, and transmitting the data received from the DeNB to each subordinate RUE by using the increased access link resource;
for any RN, if M2 times are determined continuously, after data sent by the DeNB is received each time, the received data are sent on the allocated access link resources, when the data sent by the DeNB is received again after the M2 times continuously, the received access link resources allocated by the DeNB for the data sending are reduced, and the data received from the DeNB are sent to the subordinate RUEs by utilizing the reduced access link resources;
wherein both M1 and M2 are positive integers greater than 1.
3. The method of claim 1, further comprising:
the DeNB groups RNs, and the distance between RNs in each group needs to be larger than a preset threshold value; and distributing the same access link resource for each RN in the same group, and distributing the access link resource for the RNs in each group according to the principle that the allocated access link resources among different groups are orthogonal to each other to the greatest extent.
4. A method for coordinating interference between Relay Nodes (RNs) is characterized in that the method is suitable for type 1 in-band RNs;
for any RN, when data transmitted by a donor evolved node B DeNB is received, the following processing is carried out:
determining the number of access link resources required for sending the data received from the DeNB;
randomly selecting required access link resources from the access link resources according to a determination result, and transmitting data received from the DeNB to subordinate relay terminals RUEs by using the selected access link resources;
wherein the determining the number of access link resources required to finish sending the data received from the DeNB comprises:
calculating the number of access link subframes N3 required for transmitting the data received from the DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one resource block RB, NRBRepresenting the total number of RBs within the system bandwidth;
the randomly selecting the required access link resource from the access link resources according to the determination result comprises:
randomly selecting N3 access link sub-frames from an access link sub-frame set as required access link resources;
or, the determining the number of access link resources required for transmitting the data received from the DeNB includes:
calculating the number of RBs N4 required for transmitting the data received from the DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one RB, NASFRepresenting the number of access link subframes within a radio frame;
the randomly selecting the required access link resource from the access link resources according to the determination result comprises:
and randomly selecting N4 RBs from the RBs in the system bandwidth as required access link resources.
5. The method of claim 4, further comprising:
if it is determined that the data sent by the DeNB is transmitted for M1 times continuously, after the data sent by the DeNB is received each time, the received data is not completely transmitted on the selected access link resource, when the data sent by the DeNB is received again after M1 times continuously, the selected access link resource for the data transmission is increased, and the data received from the DeNB is transmitted to each subordinate RUE by using the increased access link resource;
if the continuous M2 times is determined, after the data sent by the DeNB is received each time, the received data are sent on the selected access link resources, when the data sent by the DeNB is received again after the continuous M2 times, the selected access link resources for the data sending are reduced, and the data received from the DeNB are sent to the subordinate RUEs by utilizing the reduced access link resources;
wherein both M1 and M2 are positive integers greater than 1.
6. A donor evolved NodeB (DeNB), comprising:
the first processing module is used for informing the second processing module to execute the self-function when the DeNB is determined to need to send data to each subordinate relay node RN, and each RN is a type 1 in-band RN;
the second processing module is configured to determine the number of access link resources required for each RN to finish sending and receiving data from the DeNB; allocating access link resources for the RNs respectively according to the determination result and the principle that the allocated access link resources among the RNs are orthogonal to the maximum extent, so that the RNs can transmit the data received from the DeNB to subordinate relay terminals RUE by using the allocated access link resources;
for each RN, the second processing module respectively calculates an access link subframe number N1 required for the RN to finish sending data received from the DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one resource block RB, NRBRepresenting the total number of RBs within the system bandwidth;
the second processing module respectively allocates access link subframes with the same number as the corresponding calculation results for each RN, and enables the allocated access link subframes among the RNs to be orthogonal to the maximum extent;
or, for each RN, the second processing module calculates the number of RBs N2 required by the RN to finish transmitting the data received from the DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one RB, NASFRepresenting the number of access link subframes within a radio frame;
and the second processing module respectively allocates RBs with the same number as the corresponding calculation results for each RN, and enables the allocated RBs among the RNs to be orthogonal to the maximum extent.
7. The DeNB of claim 6, wherein the second processing module is further configured to,
grouping RNs, wherein the distance between RNs in each group needs to be larger than a preset threshold value; and distributing the same access link resource for each RN in the same group, and distributing the access link resource for the RNs in each group according to the principle that the allocated access link resources among different groups are orthogonal to each other to the greatest extent.
8. A relay node, RN, wherein the RN is a 1-band intra-RN, comprising:
the third processing module is used for informing the fourth processing module to execute the self function when receiving the data sent by the host evolved node B DeNB and sending the received data to the fourth processing module;
the fourth processing module is configured to determine the number of access link resources required for sending the received data; randomly selecting required access link resources from the access link resources according to a determination result, and transmitting the received data to subordinate relay terminals RUE by using the selected access link resources;
wherein, the fourth processing module calculates the number of access link subframes N3 required for sending the received data:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one resource block RB, NRBRepresenting the total number of RBs within the system bandwidth;
the fourth processing module randomly selects N3 access link sub-frames from the access link sub-frame set as required access link resources;
or, the fourth processing module calculates the number of RBs N4 required for transmitting the data received from the DeNB:
wherein,denotes rounding up, K denotes the number of RUEs subordinate to the RN, TkIndicates the amount of data, DR, that the RN is to transmit to the kth RUE of the subordinate RUEskRepresents the average transmission rate of the k-th RUE in the RUEs under the RN within one RB, NASFRepresenting the number of access link subframes within a radio frame;
and the fourth processing module randomly selects N4 RBs from the RBs in the system bandwidth as required access link resources.
9. The RN of claim 8, wherein the fourth processing module is further configured to,
if it is determined that the data sent by the DeNB is transmitted for M1 times continuously, after the data sent by the DeNB is received each time, the received data is not completely transmitted on the selected access link resource, when the data sent by the DeNB is received again after M1 times continuously, the selected access link resource for the data transmission is increased, and the data received from the DeNB is transmitted to each subordinate RUE by using the increased access link resource;
if the continuous M2 times is determined, after the data sent by the DeNB is received each time, the received data are sent on the selected access link resources, when the data sent by the DeNB is received again after the continuous M2 times, the selected access link resources for the data sending are reduced, and the data received from the DeNB are sent to the subordinate RUEs by utilizing the reduced access link resources;
wherein both M1 and M2 are positive integers greater than 1.
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