CN107995665B - Service path selection method, device and main base station - Google Patents
Service path selection method, device and main base station Download PDFInfo
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- CN107995665B CN107995665B CN201610948027.2A CN201610948027A CN107995665B CN 107995665 B CN107995665 B CN 107995665B CN 201610948027 A CN201610948027 A CN 201610948027A CN 107995665 B CN107995665 B CN 107995665B
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Abstract
The invention discloses a method, a device and a main base station for selecting a service path, which relate to the technical field of communication, wherein the method comprises the following steps: determining the service data volume required to be sent to the UE in a path selection period; determining transmission time required for transmitting the service data volume to the UE through the main path and the auxiliary path respectively; and selecting a path with shorter transmission time from the main path and the auxiliary path as a service path for transmitting service data to the UE in the path selection period. The method, the device and the main base station for selecting the service path can reduce the transmission delay of the service, fully utilize the resources of the main base station and the auxiliary base station and do not need to exchange load and channel state information between the base stations.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for selecting a service path, and a master base station.
Background
In the 3GPP (3rd Generation Partnership Project) Rel-10/11 research phase, 3GPP proposes a carrier aggregation technique for aggregating multiple carriers to achieve a larger bandwidth, thereby providing a faster data transmission rate. In the application scenario of the carrier aggregation technology, a radio remote head (radio remote head) unit is directly connected with a macro base station through a high-quality optical fiber, the signaling transmission time delay between the radio remote head unit and the macro base station is small, and the method is suitable for centralized scheduling at the macro base station. Entering the 3GPP Rel-12 research stage, the NTT DoCoMo company provides a small cell enhancement research project and provides a non-ideal backhaul scenario. In such a scenario, the mechanism of centralized scheduling is difficult to apply, and distributed Medium Access Control (MAC) scheduling must be adopted.
The dual connectivity technology is identified as a new technology suitable for such a scenario, and specifically refers to a technology in which a terminal in a Radio Resource Control (RRC) connected state is simultaneously served by at least two network nodes (e.g., a main base station and a secondary base station), and roles played by the network nodes in serving the same terminal are independent of power classes of the nodes. A typical scenario is that one macro base station and one small base station simultaneously provide services for a terminal. The dual connectivity technology allows the bearer to be split at the side of the main base station, and the data to be carried can be divided into two parts, which are respectively transmitted to the UE via the main base station and the auxiliary base station. The dual-connection flow control technology is a technology for controlling data offloading of a main base station and a secondary base station, but in the existing dual-connection data flow control technology, a technical scheme for specifically realizing control over data flow is not provided.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method, an apparatus and a main base station for selecting a traffic path.
According to an aspect of the present invention, there is provided a traffic path selection method, including: determining the service data volume required to be sent to User Equipment (UE) in a path selection period; determining transmission time required for transmitting the service data volume to the UE through a main path and an auxiliary path respectively; the main path is a path for directly transmitting data between a main base station and the UE, and the auxiliary path is a path for transmitting data between the main base station and the UE through an auxiliary base station; and selecting a path with shorter transmission time from the main path and the auxiliary path as a service path for transmitting service data to the UE in the path selection period.
Optionally, determining a transmission duration required for the traffic data volume to be transmitted to the UE through the main path includes: determining base station capacity of the master base station in an nth path selection period
Determining a main path transmission duration in the nth path selection period
Wherein Δ d (n) is the traffic data volume in the nth path selection period.
Optionally, the determining the traffic data amount is performed by a secondary deviceThe transmission duration required for path transmission to the UE comprises: determining the base station capacity of the secondary base station in the nth path selection period
Determining a time delay tau for the traffic data volume transmitted from the primary base station to the secondary base station in the nth path selection periodnDetermining a secondary path transmission duration in the nth path selection period
Optionally, said Δ d (n) ═ αnT, wherein, αnAnd T is the time length of the path selection period, wherein T is the data arrival rate of the main base station side in the nth path selection period.
Optionally, the determining is performed according to the transmission rate of the base station in the previous period and the transmission delay between the base stations
The above-mentioned
And said τ beingnThe value of (c).
Optionally, the main path and the auxiliary path are respectively selected as the traffic path in the 1 st and 2 nd path selection periods to transmit traffic data to the UE; acquiring an initial capacity value of the main base station, an initial capacity value of the auxiliary base station and an initial time delay of the service data volume transmitted from the main base station to the auxiliary base station; and determining the base station capacity of the main base station, the base station capacity of the auxiliary base station and the time delay of the service data volume transmitted from the main base station to the auxiliary base station in the 3rd path selection period according to the initial capacity value of the main base station, the initial capacity value of the auxiliary base station and the initial time delay respectively.
Optionally, receiving a transmission rate of the secondary base station sent by the secondary base station through an X2 interface message, and a time for sending the X2 interface message; and determining the base station capacity of the auxiliary base station based on the transmission rate of the auxiliary base station, and determining the time delay of the transmission of the service data volume from the main base station to the auxiliary base station based on the time for sending the X2 interface message.
Optionally, the secondary base station fills the transmission rate and the current Time of the secondary base station into the History throughput information and the Time stamp field in the X2 interface message, respectively.
According to another aspect of the present invention, there is provided a traffic path selecting apparatus, including: a service data determining module, configured to determine a service data amount that needs to be sent to the UE in a path selection period; a transmission duration determining module, configured to determine a transmission duration required for transmitting the service data volume to the UE through a main path and an auxiliary path, respectively; the main path is a path for directly transmitting data between a main base station and the UE, and the auxiliary path is a path for transmitting data between the main base station and the UE through an auxiliary base station; and the service path selection module is used for selecting a path with shorter transmission time from the main path and the auxiliary path as a service path for transmitting service data to the UE in the path selection period.
Optionally, the transmission duration determining module is further configured to determine a base station capacity of the master base station in the nth path selection period
Determining a main path transmission duration in the nth path selection period
Wherein Δ d (n) is the traffic data volume in the nth path selection period.
Optionally, the transmission duration determining module is further configured to determine a base station capacity of the secondary base station in the nth path selection period
Determining the n-thTime delay tau of said traffic data volume transmitted from said master base station to said secondary base station in each path selection periodnDetermining a secondary path transmission duration in the nth path selection period
Optionally, the traffic data determining module is further configured to determine the Δ d (n) ═ αn·T；
Wherein, αnAnd T is the time length of the path selection period, wherein T is the data arrival rate of the main base station side in the nth path selection period.
Optionally, the transmission duration determining module is further configured to determine the transmission duration according to the transmission rate of the base station in the previous period and the transmission delay between base stations
The above-mentioned
And said τ beingnThe value of (c).
Optionally, the traffic path selecting module is further configured to select the main path and the auxiliary path as the traffic paths to transmit traffic data to the UE in 1 st and 2 nd path selection periods, respectively; the transmission duration determining module is configured to obtain an initial capacity value of the master base station, an initial capacity value of the secondary base station, and an initial time delay of the service data volume transmitted from the master base station to the secondary base station; and determining the base station capacity of the main base station, the base station capacity of the auxiliary base station and the time delay of the service data volume transmitted from the main base station to the auxiliary base station in the 3rd path selection period according to the initial capacity value of the main base station, the initial capacity value of the auxiliary base station and the initial time delay respectively.
Optionally, the message receiving module is configured to receive a transmission rate of the secondary base station sent by the secondary base station through an X2 interface message, and a time for sending the X2 interface message; the transmission duration determining module is configured to determine a base station capacity of the secondary base station based on the secondary base station transmission rate, and determine a time delay of the service data volume transmitted from the primary base station to the secondary base station based on the time for sending the X2 interface message.
According to still another aspect of the present invention, there is provided a master base station including: a traffic routing apparatus as described above.
The service path selection method, the device and the base station can obtain the transmission delay estimated values of the services respectively passing through the main base station and the auxiliary base station according to the service reaching rate, the base station capacity and the transmission delay among the base stations, further select the path with lower delay for data transmission, and can reduce the transmission delay of the services.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating an embodiment of a traffic path selection method according to the present invention;
fig. 2 is a diagram illustrating the secondary base station sending an X2 interface DL DATA DELIVERY STATUS message to the primary base station;
FIG. 3 is a PDU format diagram of the DL DATA DELIVERY STATUS message;
fig. 4 is a block diagram of an embodiment of a traffic path selection apparatus according to the present invention.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The technical solution of the present invention is described in various aspects below with reference to various figures and embodiments.
Fig. 1 is a flowchart illustrating an embodiment of a service path selection method according to the present invention, as shown in fig. 1:
The service path selection method in the above embodiment can select a path with a lower delay for data transmission according to the delay estimation values of the service traffic transmitted through the primary base station and the secondary base station, respectively, so as to reduce the transmission delay of the service.
In one embodiment, among the primary path and the secondary path, a path capable of completing traffic transmission in a shorter time is selected for data transmission. Determining base station capacity of a master base station in an nth path selection period
The capacity of the base station is determined by the number of carrier frequencies, and the data transmission rate of the main base station in the nth path selection period can be determined by calculating or estimating the data transmission rate of the main base station based on the corresponding relation between the capacity of the main base station and the data transmission rate of the main base station and according to the corresponding relation
Determining a main path transmission duration in an nth path selection period
Δ d (n) is the traffic data volume in the nth path selection period.
Determining base station capacity of secondary base station in nth path selection period
The data transmission rate of the auxiliary base station in the nth path selection period can be determined by calculating or estimating the data transmission rate of the auxiliary base station based on the corresponding relation between the base station capacity of the auxiliary base station and the data transmission rate of the auxiliary base station according to the corresponding relation
Determining a secondary path transmission duration in an nth path selection period
τnThe time delay for the transmission of the traffic data amount in the nth path selection period from the main base station to the secondary base station.
The amount of the service data buffered at the main base station side is Delta D (n) αn·T；αnIn order to obtain the data arrival rate at the master base station side in the nth path selection period, that is, the transmission rate at which the master base station side receives the service data, the service data needs to be transmitted to the UE. T is the duration of the path selection period, and may be set according to requirements, for example, 10 seconds, 20 seconds, and the like.
The service path selection method in the above embodiment can select a path with a lower transmission delay according to the data volume of the service, the data sending rate of the main base station and the auxiliary base station, and the transmission delay between the base stations, so as to minimize the transmission delay of the service.
The path selection mechanism of the traffic can be triggered in a fixed period, which is denoted as T. During the path selection of the nth period, the main base station does not know the capacities of the main base station and the auxiliary base station in the nth period, the transmission delay of the X2 interface between the base stations, and the like, and these parameters need to be estimated.
Various methods can be used to determine the transmission rate of the base station and the transmission delay between the base stations in the last period
And τnThe value of (c). For example,
the base station capacity in the (n + 1) th path selection period for the main base station,
for the base station capacity, τ, of the secondary base station in the (n + 1) th path selection periodn+1The time delay of the transmission of the service data from the main base station to the auxiliary base station in the (n + 1) th path selection period is respectively determined according to the time delay
And τnDetermination of value of
τn+1The value of (c).
For example, the correspondence relationship between the base station capacities of the main base station and the secondary base station and the data transmission rates, and the trend of change of the transmission rates based on the history data, the state, the time, and the like may be determined from the history data, an estimation formula may be generated, the data transmission rates of the main base station and the secondary base station in the previous cycle may be substituted into the estimation formula, and the base station capacities of the main base station and the secondary base station in the current cycle may be calculated. And (3) the transmission delay between the base stations through the X2 interface uses the transmission delay of the last period fed back by the auxiliary base station as the delay of the current service data volume transmitted from the main base station to the auxiliary base station.
The base station capacity can be measured by using the average speed of the application layer of the main base station and the auxiliary base station or the average speed of the PDCP (Packet Data Convergence protocol) layer, and the interaction of load and channel state information among the base stations is not needed
The initial capacity value of the main base station, the initial capacity value of the secondary base station and the initial time delay of the transmission of the service data volume from the main base station to the secondary base station need to be determined. The initial values of the parameters can be set according to the empirical values, or the main path and the auxiliary path can be respectively selected in the 1 st path selection period and the 2 nd path selection period as the service paths to transmit the service data to the UE, so as to obtain the initial capacity value of the main base station, the initial capacity value of the auxiliary base station and the initial time delay of the service data transmitted from the main base station to the auxiliary base station.
For example, in the 1 st and 2 nd periods, the service selects the primary path and the secondary path respectively to obtain initial values of the capacity of the primary base station, the capacity of the secondary base station and the transmission delay of the interface between the base stations, and the arrival rate of the service in the 2 nd period is used as the initial value of the arrival rate. And determining the base station capacity of the main base station, the base station capacity of the auxiliary base station and the time delay of the service data volume transmitted from the main base station to the auxiliary base station in the 3rd path selection period according to the initial capacity value of the main base station, the initial capacity value of the auxiliary base station and the initial time delay.
And (3) respectively calculating a main path transmission time length estimation value and an auxiliary path transmission time length estimation value by substituting the formula (1) and the formula (2) from the 3rd period according to the path selection parameter value. And comparing the transmission time lengths of the main path and the auxiliary path, and selecting the path with the shorter transmission time length to carry out the data transmission of the period. When the period is over, if the main path is selected, the capacity of the main base station is updated; and if the auxiliary path is selected, updating the capacity of the auxiliary base station and the transmission time delay between the base stations according to the feedback information of the auxiliary base station.
The main base station receives the data transmission rate of the auxiliary base station and the time delay of the transmission of the service data volume from the main base station to the auxiliary base station, which are sent by the auxiliary base station through the X2 interface message, and the base station capacity of the auxiliary base station can be determined based on the data transmission rate of the auxiliary base station. Various X2 interface messages may be used, for example, DL DATA DELIVERY STATUS messages are used to send the secondary base station transmission rate, the delay in the transmission of traffic data from the primary base station to the secondary base station, as shown in fig. 2.
The PDU type 1 format of the data plane protocol of the X2 port is defined in the 3GPP standard 36.425, which is used to support information transfer from the secondary base station to the primary base station, as shown in fig. 3, two fields, namely, a History throughput information field and a Time stamp field, may be added to the PDU to feed back the feedback transmission rate of the secondary base station and the transmission delay between the base stations.
Protocol Data unit pdu (protocol Data unit) refers to a unit of Data transferred between peer layers. The auxiliary base station performs feedback once every Time data transmission of one period is performed, the high throughput information comprises the transmission rate of the auxiliary base station of the previous period, the Time stamp comprises the sending Time of the feedback PDU, and the main base station can estimate the transmission delay of the interface between the base stations according to the receiving Time.
The service path selection method, the device and the base station in the embodiments can obtain the transmission delay estimation values of the services respectively passing through the main base station and the auxiliary base station according to the service arrival rate, the base station capacity and the transmission delay between the base stations, and further select a path with lower delay for data transmission; load and channel state information do not need to be interacted between base stations;
in one embodiment, as shown in fig. 4, the present invention provides a traffic routing apparatus 40, including: a service data determining module 41, a transmission duration determining module 42, a service path selecting module 43 and a message receiving module 44. The traffic data determining module 41 determines the amount of traffic data that needs to be sent to the user equipment UE in the path selection period. The transmission duration determining module 42 determines the transmission duration required for transmitting the service data volume to the UE through the main path and the auxiliary path, respectively; the main path is a path for directly transmitting data with the UE by the main base station, and the auxiliary path is a path for transmitting data with the UE by the main base station through the auxiliary base station. The traffic path selection module 43 selects a path with a shorter transmission duration from the primary path and the secondary path as a traffic path for transmitting traffic data to the UE in the path selection period.
The service data determining module 41 determines the service data amount Δ d (n), Δ d (n) ═ α in the nth path selection periodnT, wherein, αnT is the time length of the path selection period, which is the data arrival rate of the master base station side in the nth path selection period.
Transmission duration determination module 42 determines that the primary base station is on the nth wayBase station capacity in path selection period
Determining a main path transmission duration in an nth path selection period
Transmission duration determination module 42 determines the base station capacity of the secondary base station in the nth path selection period
Determining a time delay tau for a traffic data volume transmitted from a primary base station to a secondary base station in an nth path selection periodnDetermining a secondary path transmission duration in the nth path selection period
The transmission duration determining module 42 determines the transmission duration between the base stations according to the transmission rate of the base station in the previous period and the transmission delay between the base stations
And τnThe value of (c).
The traffic path selection module 43 selects the primary path and the secondary path as the traffic paths to transmit the traffic data to the UE in the 1 st and 2 nd path selection periods, respectively. The transmission duration determining module 42 obtains the initial capacity value of the main base station, the initial capacity value of the secondary base station, and the initial delay of the service data amount transmitted from the main base station to the secondary base station, and determines the base station capacity of the main base station, the base station capacity of the secondary base station, and the delay of the service data amount transmitted from the main base station to the secondary base station in the 3rd path selection period according to the initial capacity value of the main base station, the initial capacity value of the secondary base station, and the initial delay, respectively.
The message receiving module 44 receives the transmission rate of the secondary base station and the delay of the transmission of the traffic data amount from the primary base station to the secondary base station, which are sent by the secondary base station through the X2 interface message. And the transmission duration determining module is used for determining the base station capacity of the secondary base station based on the transmission rate of the secondary base station.
In one embodiment, the present invention provides a master base station comprising: the traffic routing apparatus as above.
The service path selection method, the device and the base station in the above embodiments can select a path with a lower time delay for data transmission according to time delay estimation values of services transmitted through the primary base station and the secondary base station respectively; the method can obtain the transmission delay estimation values of the services respectively passing through the main base station and the auxiliary base station according to the service reaching rate, the base station capacity and the transmission delay between the base stations, and further select a path with lower delay for data transmission.
In the service path selection method, the device and the base station in the embodiments, the capacity of the base station is measured by using the average rate of the application layer or the average rate of the PDCP layer, and the load and channel state information do not need to be interacted between the base stations; the information can be obtained directly from the standardized inter-base station interaction information or indirectly through the calculation processing of the interaction information, and the protocol does not need to be modified to obtain additional information.
The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented in software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (8)
1. A method for selecting a service path, comprising:
determining the service data volume required to be sent to User Equipment (UE) in a path selection period;
determining transmission time required for transmitting the service data volume to the UE through a main path and an auxiliary path respectively; the main path is a path for directly transmitting data between the main base station and the UE, and the auxiliary path is a path for transmitting data between the main base station and the UE through the auxiliary base station;
selecting a path with shorter transmission time from the main path and the auxiliary path as a service path for transmitting service data to the UE in the path selection period;
wherein determining a transmission duration required for the traffic data volume to be transmitted to the UE via the main path comprises:
determining base station capacity of the master base station in an nth path selection period
Determining a main path transmission duration in an nth path selection period
Wherein, △ D (n) is the traffic data volume in the nth path selection period, △ D (n) - αn·T；αnThe data arrival rate of the main base station side in the nth path selection period is obtained, and T is the duration of the path selection period;
determining the base station capacity of the secondary base station in the nth path selection period
Is determined to beA time delay tau of the traffic data volume transmitted from the primary base station to the secondary base station in n path selection periodsn；
Determining a secondary path transmission duration in the nth path selection period
Determining the transmission rate of the base station and the transmission time delay between the base stations according to the last period
The above-mentioned
And said τ beingnThe value of (c).
2. The method of claim 1, further comprising:
respectively selecting the main path and the auxiliary path as the service paths in the 1 st and 2 nd path selection periods to transmit service data to the UE;
acquiring an initial capacity value of the main base station, an initial capacity value of the auxiliary base station and an initial time delay of the service data volume transmitted from the main base station to the auxiliary base station;
and determining the base station capacity of the main base station, the base station capacity of the auxiliary base station and the time delay of the service data volume transmitted from the main base station to the auxiliary base station in the 3rd path selection period according to the initial capacity value of the main base station, the initial capacity value of the auxiliary base station and the initial time delay respectively.
3. The method of any of claims 1 to 2, comprising:
receiving the transmission rate of the secondary base station sent by the secondary base station through an X2 interface message and the time for sending the X2 interface message;
and determining the base station capacity of the auxiliary base station based on the transmission rate of the auxiliary base station, and determining the time delay of the transmission of the service data volume from the main base station to the auxiliary base station based on the time for sending the X2 interface message.
4. The method of claim 3,
and the auxiliary base station respectively fills the transmission rate and the current Time of the auxiliary base station into Historgroughput information and a Time stamp field in the X2 interface message.
5. A traffic routing apparatus, comprising:
a service data determining module, configured to determine a service data amount that needs to be sent to the UE in a path selection period;
a transmission duration determining module, configured to determine a transmission duration required for transmitting the service data volume to the UE through a main path and an auxiliary path, respectively; the main path is a path for directly transmitting data between a main base station and the UE, and the auxiliary path is a path for transmitting data between the main base station and the UE through an auxiliary base station; the transmission duration determining module is further configured to determine a base station capacity of the master base station in the nth path selection period
Determining a main path transmission duration in the nth path selection period
Wherein said Δ d (n) is said traffic data volume in the nth path selection period;
a service path selection module, configured to select a path with a shorter transmission duration from the main path and the auxiliary path as a service path for transmitting service data to the UE in the path selection period;
the traffic data determining module is further configured to determine the △ D (n) - αn·T；
Wherein, αnThe data arrival rate of the main base station side in the nth path selection period is obtained, and T is the duration of the path selection period;
the transmission duration determining module is further configured to determine a base station capacity of the secondary base station in the nth path selection period
Determining a time delay tau for the traffic data volume transmitted from the primary base station to the secondary base station in the nth path selection periodnDetermining a secondary path transmission duration in the nth path selection period
Wherein the transmission rate of the base station in the last period and the transmission time delay between the base stations are determined
The above-mentioned
And said τ beingnThe value of (c).
6. The apparatus of claim 5,
the service path selection module is further configured to select the main path and the auxiliary path as the service paths to transmit service data to the UE in a 1 st and a 2 nd path selection periods, respectively;
the transmission duration determining module is configured to obtain an initial capacity value of the master base station, an initial capacity value of the secondary base station, and an initial time delay of the service data volume transmitted from the master base station to the secondary base station; and determining the base station capacity of the main base station, the base station capacity of the auxiliary base station and the time delay of the service data volume transmitted from the main base station to the auxiliary base station in the 3rd path selection period according to the initial capacity value of the main base station, the initial capacity value of the auxiliary base station and the initial time delay respectively.
7. The apparatus of claim 5, comprising:
a message receiving module, configured to receive a transmission rate of a secondary base station sent by the secondary base station through an X2 interface message and a time for sending the X2 interface message;
the transmission duration determining module is configured to determine a base station capacity of the secondary base station based on the secondary base station transmission rate, and determine a time delay of the service data volume transmitted from the primary base station to the secondary base station based on the time for sending the X2 interface message.
8. A master base station, comprising:
traffic routing device according to any one of claims 5 to 7.
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| CN111182607B (en) * | 2019-12-30 | 2021-09-24 | 四川速宝网络科技有限公司 | Double-path forwarding acceleration method based on 4G router |
| EP3886383A1 (en) * | 2020-03-23 | 2021-09-29 | Nokia Solutions and Networks Oy | Apparatus, method and computer program for routing data in a dual or multi-connectivity configuration |
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