CN108377572B - Method and apparatus for multi-user superposition transmission (MUST) - Google Patents
Method and apparatus for multi-user superposition transmission (MUST) Download PDFInfo
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Abstract
Embodiments of the present disclosure relate to a communication method and a corresponding network device and terminal device. For example, on the network device side supporting downlink multi-user superposition transmission (MUST) of a first terminal device and a second terminal device, a set of parameters indicating a resource allocation of the second terminal device is determined and broadcasted in a cell of the network device. The first terminal device is closer to the network device than the second terminal device. The parameter set includes: an indication of a spatial layer in the MUST for transmission by the second terminal device, an indication of a resource allocation type of the second terminal device, an indication of a status of resource allocation allocated to the second terminal device, and an indication of a power ratio selected by the second terminal device. A corresponding method implemented at the terminal device is also disclosed, as well as a network device and a terminal device capable of implementing the above method.
Description
Technical Field
Embodiments of the present disclosure relate generally to communication technology, and more particularly, to a communication method for multi-user superposition transmission, and a corresponding network device and terminal device.
Background
Currently, a Downlink (DL) multi-user superposition transmission (MUST) technique has been proposed for Long Term Evolution (LTE) systems. With this technique, intra-cell multi-user superposition transmission on, for example, a Physical Downlink Shared Channel (PDSCH) can be achieved in LTE systems. For DL MUST, the third generation partnership project (3GPP) standardization organization has proposed three implementations as follows: (1) transmitting the superimposed PDSCH using the same transmission scheme and the same spatial precoding vector; (2) transmitting the superimposed PDSCH using the same transmit diversity scheme; and (3) transmitting the superimposed PDSCH using the same transmission scheme but different spatial precoding vectors.
The MUST technique is particularly beneficial for improving system capacity and efficiency, etc., when the network has a large traffic load. Thus, in a network with a large traffic load, more User Equipments (UEs) may be configured as, for example, pairs of MUST, so that signals of more UEs are transmitted superimposed together, resulting in an improvement in system performance. To this end, in order to adapt to dynamic changes in traffic load in the network, it is proposed in 3GPP standardization work that the LTE system should support dynamic MUST pairing of UEs, e.g. subframe by subframe. Moreover, it is also proposed that one UE can be paired with multiple UEs on different spatial layers or in different subbands.
However, for dynamic MUST pairing, especially when the UE is switched between MUST and non-MUST subframe by subframe, it is difficult for the UE to detect signals of other UEs paired with the UE, and then it is difficult to eliminate interference caused by signals of other UEs, thereby causing serious degradation of system performance.
Disclosure of Invention
In general, embodiments of the present disclosure propose communication methods for multi-user superposition transmission, and corresponding network devices and terminal devices.
In a first aspect, embodiments of the present disclosure provide a communication method. The method comprises the following steps: at the network device, determining a set of parameters indicative of a resource allocation of the second terminal device, the set of parameters comprising: an indication of a spatial layer in the MUST for transmission by the second terminal device, an indication of a resource allocation type of the second terminal device, an indication of a status of resource allocation allocated to the second terminal device, and an indication of a power ratio selected by the second terminal device; broadcasting a set of parameters in a cell of a network device; and transmitting a superimposed signal of the first signal specific to the first terminal device and the second signal specific to the second terminal device to the first terminal device.
In a second aspect, embodiments of the present disclosure provide a method of communication. The method comprises the following steps: at a first terminal device, receiving from a network device a set of parameters indicating a resource allocation of another terminal device, the set of parameters comprising: an indication of a spatial layer in the MUST for transmission by the other terminal device, an indication of a resource allocation type of the other terminal device, an indication of a status of resource allocation allocated to the other terminal device, and an indication of a power ratio selected by the other terminal device; receiving, from a network device, a superimposed signal of a first signal specific to a terminal device and another signal specific to another terminal device; and detecting a first signal from the received superimposed signal based at least in part on the spatial layer, the resource allocation type, the state of the resource allocation, and the power ratio.
In a third aspect, embodiments of the present disclosure provide a network device. The network device includes: a controller configured to: determining a set of parameters indicative of a resource allocation of the second terminal device, the set of parameters comprising: an indication of a spatial layer in the MUST for transmission by the second terminal device, an indication of a resource allocation type of the second terminal device, an indication of a status of resource allocation allocated to the second terminal device, and an indication of a power ratio selected by the second terminal device; and a transceiver configured to: broadcasting a set of parameters in a cell of a network device; and transmitting a superimposed signal of the first signal specific to the first terminal device and the second signal specific to the second terminal device to the first terminal device.
In a fourth aspect, embodiments of the present disclosure provide a terminal device. The terminal device includes: a transceiver configured to: receiving from the network device a set of parameters indicating a resource allocation of the other terminal device, the set of parameters comprising: an indication of a spatial layer in the MUST for transmission by the other terminal device, an indication of a resource allocation type of the other terminal device, an indication of a status of resource allocation allocated to the other terminal device, and an indication of a power ratio selected by the other terminal device; and receiving from the network device a superimposed signal of the first signal specific to the terminal device and the further signal specific to the further terminal device; and a controller configured to: a first signal is detected from the received superimposed signal based at least in part on the spatial layer, the type of resource allocation, the state of the resource allocation, and the power ratio.
As will be understood from the following description, according to an embodiment of the present disclosure, since an indication of a spatial layer is used instead of RI and PMI, 1-bit overhead can be reduced for each record. At the same time, the indication of the transmission resource allocation type is more efficient than the transmission TM. Furthermore, jointly encoding the indication of the space layer and the indication of the resource allocation type may further reduce the 1-bit overhead for each record. Since at least 2-bit overhead is reduced for each record, system performance can be improved compared to current common DCI designs.
It should be understood that the statements herein reciting aspects are not intended to limit the critical or essential features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.
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The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, like or similar reference characters designate like or similar elements, and wherein:
FIG. 1 illustrates an example communication network in which embodiments of the present disclosure may be implemented;
fig. 2 illustrates a flow diagram of an example communication method at a network device, in accordance with certain embodiments of the present disclosure;
FIG. 3 illustrates example assistance information in accordance with certain embodiments of the present disclosure;
fig. 4 illustrates a flow chart of an example communication method at a terminal device, in accordance with certain embodiments of the present disclosure;
fig. 5 illustrates a block diagram of an apparatus operating at a network device, in accordance with certain embodiments of the present disclosure;
fig. 6 illustrates a block diagram of an apparatus operating at a terminal device, in accordance with certain embodiments of the present disclosure; and
fig. 7 illustrates a block diagram of an apparatus in accordance with certain embodiments of the present disclosure.
Throughout the drawings, the same or similar reference numbers refer to the same or similar elements.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.
The term "network device" as used herein refers to a base station or other entity or node having a particular function in a communication network. A "base station" (BS) may represent a node B (NodeB or NB), an evolved node B (eNodeB or eNB), a Remote Radio Unit (RRU), a Radio Head (RH), a Remote Radio Head (RRH), a relay, or a low power node such as a pico base station, a femto base station, or the like. In the context of the present disclosure, the terms "network device" and "base station" may be used interchangeably for purposes of discussion convenience, and may primarily be referred to as an eNB as an example of a network device.
The term "terminal device" as used herein refers to any terminal device capable of wireless communication with a base station or with each other. As an example, the terminal device may include a User Equipment (UE), a Mobile Terminal (MT), a Subscriber Station (SS), a Portable Subscriber Station (PSS), a Mobile Station (MS), or an Access Terminal (AT), and the above-described devices in a vehicle. In the context of the present disclosure, the terms "terminal device" and "user equipment/UE" may be used interchangeably for purposes of discussion convenience.
The term "downlink multi-user superposition transmission" (or DL MUST) as used herein refers to transmission of DL signals to multiple terminal devices superimposed (or combined) together by a base station. In this case, the signal received by the terminal device from the base station includes both its own signal (or useful signal) and the signals of other terminal devices (or interfering signals).
The term "spatial layer" as used herein refers to a spatial transport channel layer. By setting specific weight vectors for a plurality of transmission antennas, spatial layers separated from each other can be formed.
The terms "include" and variations thereof as used herein are inclusive and open-ended, i.e., "including but not limited to. The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment". Relevant definitions for other terms will be given in the following description.
As mentioned above, in current 3GPP standardization work, it has been proposed that UEs can be dynamically configured into MUST pairs on a subframe-by-subframe basis, and that UEs can be paired with multiple other UEs on different spatial layers or in different subbands. However, in the case of dynamic MUST pairing, particularly in the case of dynamically switching MUST configuration and non-MUST configuration on a subframe-by-subframe basis, it is difficult to cancel signal interference of other UEs paired therewith on the UE side. Such interference cancellation is more difficult especially when the UE is paired with multiple other UEs in one subframe, for example, when the UE is paired with different UEs in multiple spatial layers, respectively.
It has been proposed in the 3GPP standards that some candidate parameters may be transmitted from the serving eNB to the UE to assist the UE in detecting signals of its paired UE; but the UE is also allowed to obtain further parameters by blind detection. However, these candidate parameters can only be transmitted at long time intervals by higher layer signaling. These parameters are difficult to work with for signal detection on the UE side when the MUST pair (or handover) is dynamically updated in different sub-frames. In addition, if the UE acquires all parameters through blind detection, the decoding complexity of the UE may be too high and time may be too time-consuming. Therefore, this blind detection method cannot be applied to dynamic switching (or handover) of MUST.
For this reason, an effective way is needed to enable the near-end UE to know the interference situation caused by the paired far-end UE in time. In the context of the present disclosure, a near-end UE and a far-end UE refer to a terminal device closer to a network device (e.g., a base station) and a terminal device farther from the network device in a MUST pair, respectively.
For example, it is necessary to transmit to the near-end UE a signal indicating the resource allocation of the paired far-end UE (i.e., the presence of the far-end UE on a Physical Resource Block (PRB) or Resource Block Group (RBG) allocated to the near-end UE) and the allocated transmission power of the paired far-end UE. Therefore, the near-end UE can cancel interference caused by a signal of the far-end UE in the dynamic DL MUST, and detect its own useful signal. This is particularly advantageous for near end UEs in the MUST pair, since the eNB traditionally allocates higher power to the far end UE than to the near end UE, and accordingly the interference from the paired UE at the near end UE will be stronger.
In order to indicate to the near-end UE the resource allocation and the allocated transmission power of the paired far-end UE, two approaches are conventionally adopted. One way is to insert the resource allocation and allocated transmission power of the paired far-end UE into Downlink Control Information (DCI) of the near-end UE in order to inform the near-end UE of the PRG/RBG of the paired far-end UE. Yet another way is to place the resource allocation information of all the far-end UEs together with the allocated transmission power in a common DCI in a common search space so that all the near-end UEs can search for the resource allocation information of their own paired far-end UEs. Both of these methods have their own advantages and disadvantages.
The first way may specifically indicate to each near-end UE resource allocation information of its paired far-end UE, and information of Modulation and Coding Scheme (MCS), rank, Precoding Matrix Index (PMI), redundancy version number (rvid), and the like of the paired far-end UE. However, since multiple far-end UEs may be paired to a near-end UE in different PRGs/RBGs, overhead of transmitting the far-end UE may be large, and the size of DCI may not be fixed. It is contemplated that the number of paired far-end UEs may vary from subframe to subframe, which increases the complexity of blind detection, or involves more signaling to inform the near-end UE of the length of the additional resource allocation information of the paired far-end UEs.
Since reducing signaling overhead is quite necessary in designing DCI for MUST in the case of dynamic pairing and handover, it is more preferable to place resource allocation information of all remote UEs in fixed-size DCI in a common search space. For example, in case of using the RBG bitmap to indicate resource allocation type 0, the common DCI marks whether each RBG is allocated for any remote UE. Further, each near-end UE may search the common DCI and correspondingly find whether a far-end UE paired for MUST transmission is allocated on the RBG allocated to the near-end UE. Accordingly, signaling overhead may be saved, and the size of the common DCI may be fixed to reduce the complexity of blind detection of the near-end UE.
Currently, it has been proposed that a common DCI design should contain multiple records with different parameters for multiple remote UEs served in the same subframe, where each record includes the following fields of information of the paired remote UE: resource Block (RB) allocation; transmission Mode (TM)/Rank Index (RI)/Precoding Matrix Index (PMI); and a power ratio index. However, transmission of PMI and RI is unnecessary, which brings additional overhead, resulting in degradation of system performance.
To address these and other potential problems, at least in part, embodiments of the present disclosure provide a method of communication. According to the method, a set of parameters indicating resource allocation of one terminal device (referred to as "first terminal device") and another terminal device (referred to as "second terminal device") may be determined on a network device side supporting DL MUST of the second terminal device, and broadcasted in a cell of the network device. The parameter set may include: an indication of a spatial layer in the MUST for transmission by the second terminal device, an indication of a resource allocation type of the second terminal device, an indication of a status of resource allocation allocated to the second terminal device, and an indication of a power ratio selected by the second terminal device. Further, according to the method, the indication of the spatial layer and the indication of the resource allocation type may be jointly encoded prior to broadcasting the parameter set.
According to an embodiment of the present disclosure, since the indication of the spatial layer is used instead of the RI and PMI, 1-bit overhead can be reduced for each record. At the same time, the indication of the transmission resource allocation type is more efficient than the transmission TM. Furthermore, jointly encoding the indication of the space layer and the indication of the resource allocation type may further reduce the 1-bit overhead for each record. The present invention can improve system performance compared to current common DCI designs, since at least 2-bit overhead is reduced for each record.
Fig. 1 illustrates an example communication network 100 in which embodiments of the present disclosure may be implemented. The communication network 100 comprises a network device 130 and two terminal devices, namely a first terminal device 110 and a second terminal device 120. The network device 130 may communicate with both terminal devices 110 and 120. Accordingly, the two terminal devices 110 and 120 may communicate with each other through the network device 130. It should be understood that the number of network devices and terminal devices shown in fig. 1 is for illustration purposes only and is not intended to be limiting. Network 100 may include any suitable number of network devices and terminal devices.
As shown, in this example, the first terminal device 110 is closer to the network device 130, and the second terminal device 120 is farther from the network device 130. It should be understood that this is by way of example only and not by way of limitation. The two terminal devices 110 and 120 may have any near-far positional relationship with the network device 130.
According to an embodiment of the present disclosure, the network device 130 may configure the first terminal device 110 and the second terminal device 120 as a pair of MUST to perform DL MUST. It should be understood that in addition to pairing the first terminal device 110 with the second terminal device 120, the network device 130 may also pair the first terminal device 110 with any number of other terminal devices in the network 100 as a MUST pair or a MUST group. As an example, the network device 130 may pair the first terminal device 110 with the second terminal device 120 on any of the two spatial layers.
Communications in network 100 may be implemented in accordance with any suitable communication protocol, including, but not limited to, first-generation (1G), second-generation (2G), third-generation (3G), fourth-generation (4G), and fifth-generation (5G) cellular communication protocols, wireless local area network communication protocols such as Institute of Electrical and Electronics Engineers (IEEE)802.11, and/or any other protocol now known or later developed. Moreover, the communication may utilize any suitable wireless communication technique including, but not limited to, Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Frequency Division Duplex (FDD), Time Division Duplex (TDD), Multiple Input Multiple Output (MIMO), orthogonal frequency division multiple access (OFDM), and/or any other technique now known or later developed.
According to an embodiment of the present disclosure, a set of parameters indicating resource allocation of the second terminal device 120 may be determined at the network device 130 side supporting DL MUST of the first terminal device 110 and the second terminal device 120, and broadcasted in the cell of the network device 130. The parameter set may include: an indication of the spatial layer in the MUST for the transmission of the second terminal device 120, an indication of the type of resource allocation of the second terminal device 120, an indication of the status of the resource allocation allocated to the second terminal device 120, and an indication of the power ratio selected by the second terminal device 120. The indication of the spatial layer and the indication of the resource allocation type may also be jointly encoded prior to broadcasting the parameter set.
Accordingly, the first terminal device 110 may detect the first signal from the received superimposed signal from the network device 130, the set of parameters, and the superimposed signal of the first signal specific to the first terminal device 110 and the second signal specific to the second terminal device 120, based at least in part on the spatial layer, the type of resource allocation, the status of the resource allocation and the power ratio comprised in the set of parameters. In this way, the probability that the first terminal device 110 detects its own first signal can be effectively increased, and transmission resources can be saved.
As described above, in this example, the first terminal device 110 is closer to the network device 130 than the second terminal device 120. That is, the first terminal device 110 is a near-end terminal device, and the second terminal device 120 is a far-end terminal device. In this case, as described above, to combat path loss, the network device 130 will typically allocate more power to the second terminal device 120 as the far end, and thus will generate more interference at the first terminal device 110 as the near end. The network device 130 broadcasts the parameter set, and the system performance can be improved more effectively.
It should be understood that the network device 130 broadcasting the parameter set determining the resource allocation indicating the second terminal device 120 is merely an example and not a limitation. Alternatively, the network device 130 may send the first terminal device 110 a set of parameters specific to the first terminal device 110 indicating the resource allocation of the remote terminal device paired with the first terminal device 110, thereby increasing the success rate of the useful signal detection at the first terminal device 110.
The principles and specific embodiments of the present disclosure will be described in detail below with reference to fig. 2 and 3 from the perspective of the network device 130 and the first terminal device 110, respectively. Referring first to fig. 2, a flow diagram of an example communication method 200 is shown, in accordance with certain embodiments of the present disclosure. It is to be appreciated that the method 200 may be implemented, for example, at the network device 130 as shown in fig. 1. For ease of description, the method 200 is described below in conjunction with FIG. 1.
As shown, at 210, the network device 130 may determine a set of parameters indicative of a resource allocation of the second terminal device 120. This parameter set will be described in further detail below with reference to fig. 3.
Fig. 3 illustrates example assistance information 300 in accordance with certain embodiments of the present disclosure. The assistance information 300 may comprise a set of parameters for a plurality of second terminal devices 120-1 to 120-5 (hereinafter collectively referred to as "second terminal devices 120"). The set of parameters may comprise an indication 310 of the spatial layer in the MUST for the transmission of the second terminal device 120, an indication 320 of the type of resource allocation of the second terminal device 120, an indication 330 of the status of the resource allocation allocated to the second terminal device 120, and an indication 340 of the power ratio selected by the second terminal device 120. In some embodiments, the parameter set may also include other parameters, such as PMI and RI.
The indication 310 of the spatial layer may be used to indicate whether the second terminal device 120 is configured on the first layer, the second layer, or both the first layer and the second layer in the MUST. The indication 310 of the spatial layer may be defined by table 1:
TABLE 1
As shown in table 1, the indication 310 of the spatial layer may use 2 bits to indicate on which layer of the basic rank 2PMI the second terminal device 120 is configured in the MUST. In some embodiments, where the indication 310 of the spatial layer is 00, it may be used to indicate that the second terminal device 120 is not configured on the first and second layers in the MUST. In case the indication 310 of the spatial layer is 01, it may be used to indicate that the second terminal device 120 is configured on the first layer in the MUST. In case the indication 310 of the spatial layer is 10, it may be used to indicate that the second terminal device 120 is configured on the second layer in the MUST. In case the indication 310 of the spatial layer is 11, it may be used to indicate that the second terminal device 120 is configured on the first layer and the second layer in the MUST.
For example, if the first terminal device 110 is rank 2 and uses PMI
And the second terminal device 120, which is the same as the resource allocation of the first terminal device 110, uses the PMI
Since the PMI matrix of the second terminal apparatus 120 is the same as the second column of the PMI matrix of the first terminal apparatus 110, it is known that the second terminal apparatus 120 is configured on the second layer in the MUST, that is, the indication 310 of the spatial layer is 01.
Further, as can be seen from table 1, the indication 310 of the spatial layer does not indicate on which layer of the basic rank 1PMI the second terminal apparatus 120 is disposed in the MUST. This is because when the first terminal device 110 is rank 1, the first terminal device 110 implicitly knows, through its PMI matrix, on which layer in the MUST the second terminal device 120 having the same resource configuration is configured, and therefore does not need to indicate using the indication 310 of the spatial layer.
The indication 310 of the spatial layer requires only 2 bits, compared to the technique that conventionally requires at least 3 bits to indicate 6 states of PMI and RI. The reason why the indication 310 of the spatial layer can be used instead of the indication of the PMI and RI is that the 2 transmit antenna (2Tx) codebook has a nested property and in case of case 1/2 in the MUST, is the samePairing of first terminal device 110 and second terminal device 120 on a resource may only occur on the same bundle, and therefore first terminal device 110 and second terminal device 120 need to use the same basic rank 2PMI
Or
Therefore, it is not necessary to indicate the PMI and RI, but only the indication 310 of the spatial layer needs to be used to indicate whether the second terminal device 120 is configured on the first layer, the second layer, or the first layer and the second layer in the MUST.
The indication 320 of the resource allocation type may be used to indicate that the resource allocation type of the second terminal device 120 is resource allocation type 0, resource allocation type 1 or resource allocation type 2. The indication 320 of the resource allocation type may be defined by table 2:
TABLE 2
As shown in table 2, the indication 320 of the resource allocation type may comprise 2 bits. In some embodiments, where the indication 320 of the resource allocation type is 00, it may be used to indicate resource allocation type 0. In case the indication 320 of the resource allocation type is 01, it may be used to indicate resource allocation type 1. In case the indication 320 of the resource allocation type is 10, it may be used to indicate resource allocation type 2. A case where the indication 320 of the resource allocation type is 11 may be a reservation case, which is not used to indicate the current resource allocation type.
The indication 330 of the status of the resource allocation may be used to indicate the resources allocated for the second terminal device 120. For example, in case of a scheduling granularity of 6PRB or 12PRB and a bandwidth up to 20MHz, the indication 330 of the status of the resource allocation may comprise 9 bits to indicate which RB is allocated to the second terminal device 120. The indication 330 of the status of the resource allocation in the case of resource allocation type 0, 1 or 2, respectively, will be described in further detail below. Resource allocation type 0
In resource allocation type 0, the indication 330 of the status of the resource allocation may be used to indicate the RBGs allocated to the second terminal device 120. The RBGs may be a set of local contiguous Virtual Resource Blocks (VRBs). As shown in Table 3, the size (P) of the RBG may be the downlink system bandwidth
Function of (c):
TABLE 3
As shown in Table 3, in some embodiments, the bandwidth of the downlink system
In case of not more than 10PRB, the size of RBG may be 1 PRB. In downlink system bandwidth
In the case between 11PRB and 26PRB, the size of the RBG may be 2 PRB. In downlink system bandwidth
In the case between 27PRB and 63PRB, the size of the RBG may be 3 PRB. In downlink system bandwidth
In the case between 64PRB and 110PRB, the size of the RBG may be 4 PRB.
To is directed at
Of the downlink system bandwidth, total number of RBGs (N)RBG) Can be given by the following formula:
is known to be in NRBGIn the RBG, the number of RBGs is increased,
the size of each RBG is P and is
In case that the size of the remaining one of the RBGs is
To indicate a total number of NRBGThe status of the allocation of the RBGs, the indication 330 of the status of the resource allocation may include NRBGA bit such that each bit indicates the allocation status of a corresponding RBG, such that each RBG is addressable. In some embodiments, the indication 330 of the status of resource allocation may indicate the resources allocated for the second terminal device 120 in increasing order of frequency. For example, the Least Significant Bit (LSB) of the indication 330 of the state of the resource allocation may be used to indicate NRBGThe RBG with the lowest frequency of the RBGs, and the Most Significant Bit (MSB) may be used to indicate NRBGThe RBG with the highest frequency among the RBGs. Furthermore, the value of each bit in the indication 330 of the status of resource allocation may indicate whether resources are allocated to the second terminal device 120. For example, if a particular bit in the indication 330 of the status of resource allocation has a value of 1, then the RBG corresponding to that particular bit is allocated to the second terminal device 120, otherwise the RBG is not allocated to the second terminal device 120.
As an example, in the resource allocation type 0, a cell bandwidth of 5MHz of 25PRB, a cell bandwidth of 10MHz of 50PRB, and a cell bandwidth of 20MHz of 100PRB are taken as examples of the number of bits required to calculate the indication 330 of the state of resource allocation.
Example values for the size of the RBG are shown in table 3. The size of the RBGs can also be selected as multiples of the example values provided in table 3. Thus, for example, for a cell bandwidth of 5MHz of 25PRB and a cell bandwidth of 10MHz of 50PRB, the size of the RBG is selected to be 6PRB, and for a cell bandwidth of 20MHz of 100PRB, the size of the RBG is selected to be 12 PRB.
From equation (1) above, the total number of RBGs can be calculated as follows:
As described above, the indication 330 of the status of the resource allocation may include NRBGAnd bits such that each bit indicates an allocation status of a corresponding RBG, and thus 9 bits are sufficient for indicating an RB allocated to the second terminal device 120 having the resource allocation type 0.
Resource allocation type 1
In resource allocation type 1, the number of bits required for the indication 330 of the status of the resource allocation may be calculated using a similar method as described above for resource allocation type 0. For the resource allocation type 1, in order to indicate the state of resource allocation of the second terminal device 120, the following number of bits is required:
-
a bit, size P RBG may be divided into P subsets
Bits may be used to indicate a selected subset of RBGs in the subset;
-1 bit, which 1 bit may be used to indicate an offset of the resource allocation span within the RBG subset, e.g. a value of 1 may indicate a trigger offset, a value of 0 may indicate a non-trigger offset;
-
a bit of
Each of the bits may indicate a single VRB in the RBG subset allocated for the second terminal device 120 in ascending order of frequency.
Thus, in resource allocation type 1, to indicate the status of the resource allocation of the second terminal device 120, the indication 330 of the status of the resource allocation may comprise
And (4) a bit. That is, the indication 330 of the status of resource allocation in resource allocation type 1 may comprise the same number of bits as the indication 330 of the status of resource allocation in resource allocation type 0. For example, for a cell bandwidth of 5MHz of 25PRB, a cell bandwidth of 10MHz of 50PRB and a cell bandwidth of 20MHz of 100PRB, 9 bits are sufficient for indicating the VRB allocated to the second terminal device 120 with resource allocation type 1.
Resource allocation type 2
In resource allocation type 2, the indication 330 of the status of the resource allocation may indicate a set of local contiguous VRBs or distributed VRBs allocated to the second terminal device 120. For the resource allocation type 2, in order to indicate the status of the resource allocation of the second terminal device 120, the following number of bits is required:
1 bit, which 1 bit may indicate allocation of a local contiguous VRB or a distributed VRB to the second terminal device 120 in case of transmitting a parameter set using PDCCH DCI format 1A, 1B or 1D, or using EPDCCH DCI format 1A, 1B or 1D. For example, a value of 0 indicates a locally contiguous VRB, while a value of 1 indicates a distributed VRB. Whereas in case of transmitting parameter sets using PDCCH DCI format 1C, the distributed VRB is always allocated to the second terminal device 120, so that the 1 bit is optional. The local contiguous VRBs assigned to the second end device 120 vary from a single VRB to a maximum number of VRBs spanning the system bandwidth;
-
a bit, as follows for the
The individual bits are discussed separately. For a locally contiguous VRB,
the number of bits may indicate the status of the resource allocation of the second terminal device 120. For distributed VRB, in
In the case of (a) in (b),
the number of bits may indicate the status of the resource allocation of the second terminal device 120. In addition, the
In case of (1), the interval value N may be indicated by 1 bitgapAnd additionally
The number of bits may indicate the status of the resource allocation of the second terminal device 120. In some embodiments, the 1 bit may be the MSB, and a value of 0 may indicate N, for examplegap＝Ngap,1And a value of 1 may indicate Ngap＝Ngap,2In which N isgap,1And Ngap,2Is a predefined value; .
Therefore, in the resource allocation type 2, in order to indicate the status of resource allocation of the second terminal device 120, the indication 330 of the status of resource allocation may include the number of bits (corresponding to the total number of RBGs (N)RBG) ) as follows:
as an example, in the resource allocation type 2, as in the resource allocation type 0, a cell bandwidth of 5MHz of 25PRB, a cell bandwidth of 10MHz of 50PRB, and a cell bandwidth of 20MHz of 100PRB are taken as examples of the number of bits required to calculate the indication 330 of the state of resource allocation. Similarly, for example, for a 5MHz cell bandwidth of 25 PRBs and a 10MHz cell bandwidth of 50 PRBs, the size of the RBG is selected to be 6 PRBs, and for a 20MHz cell bandwidth of 100 PRBs, the size of the RBG is selected to be 12 PRBs.
From equation (2) above, the total number of RBGs can be calculated as follows:
Therefore, the temperature of the molten metal is controlled,
one bit is sufficient for indicating the VRB allocated to the second terminal device 120 having a resource allocation type 2, the 7 bits fitting into the budget of 9 bits of the indication 330 of the status of the resource allocation.
The indication 340 of the power ratio may be used to indicate the power ratio selected by the second terminal device 120. For each pairing of first terminal device 110 and second terminal device 120, although first terminal device 110 may employ 3 modulation schemes of QPSK, 16QAM, or 64QAM, second terminal device 120 can only employ a modulation scheme of QPSK, and thus there are 3 modulation combinations. For modulation combining QPSK + QPSK, the candidate power ratio is {8/10,50/58,264.5/289 }. For modulation combining QPSK + + QPSK, the candidate power ratio is {32/42,144.5/167,128/138 }. For the modulation combination 64QAM + QPSK, the candidate power ratio is {128/170,40.5/51,288/330 }. Accordingly, there are 3 candidate power ratios for each modulation combination of the MUST pair. Thus, the indication 340 of the power ratio may comprise 2 bits for indicating the power ratio selected by the second terminal device 120 among the 3 candidate power ratios.
With the parameter set described in connection with fig. 3, 1-bit overhead can be reduced for each recording compared to the conventional approach, thereby improving system performance.
Referring back to fig. 2, optionally, at 220, the network device 130 may jointly encode an indication 310 of the spatial layer and an indication 320 of the resource allocation type prior to broadcasting the parameter set. The indication of spatial layer 310 and the indication of resource allocation type 320 have only 7 possibilities due to the limitations of the following conditions specified in the MUST case 1/2. The overhead of 2 bits of the indication 310 of the spatial layer and the overhead of 2 bits of the indication 320 of the resource allocation type may be jointly encoded, thereby being represented using 3 bits. Thus, the 1-bit overhead is further reduced for each record.
Examples of the above conditions may include, but are not limited to:
-the MUST pairing is limited to 2CRS (cell specific reference signal (CRS) based transmission mode for 2 transmit antennas) and TM (transmission mode) 2/3/4;
the first terminal device 110 and the second terminal device 120 use the same PMI, so only an indication 310 of a spatial layer of 2 bits needs to be used when indicating the PMI used by the second terminal device 120;
the second terminal device 120 can only use the QPSK modulation scheme, and therefore does not need to transmit the modulation scheme of the second terminal device 120;
there are 3 candidate power ratios for each modulation combination of the MUST pair;
-resource allocation type 2 for rank 1TM3 and TM2 using transmit diversity;
The indication 310 of the jointly encoded spatial layer and the indication 320 of the resource allocation type may be defined by table 5:
TABLE 5
As shown in table 5, the indication 310 of the jointly encoded spatial layer and the indication 320 of the resource allocation type may use 3 bits to indicate the pairing case of the MUST and the TM. For example, in case the indication 310 of the jointly coded spatial layer and the indication 320 of the resource allocation type are 000, it may be used to indicate that the second terminal device 120 is paired with the first terminal device 110 on the first layer and uses resource allocation type 0.
Next, at 230, the network device 130 may broadcast the set of parameters in its cell. In some embodiments, the network device 130 may broadcast the parameter sets in a common DCI. Alternatively, the network device 130 may send the first terminal device 110 a set of parameters specific to the first terminal device 110.
Optionally, at 240, the network device 130 may also send a parameter set acquisition indication to the first terminal device 110. The parameter set acquisition indication may comprise 2 bits, and the 2 bits may be used to indicate whether the first terminal device 110 is paired for the MUST and whether the resource allocation between the first terminal device 110 and the paired second terminal device 120 is aligned, respectively. Thus, the parameter set acquisition indication may indicate that the first terminal device 110 reads the common DCI if the first terminal device 110 is paired for the MUST and the resource allocation is not aligned.
At 250, the network device 130 may also transmit a superimposed signal of the first signal specific to the first terminal device 110 and the second signal specific to the second terminal device 120 to the first terminal device 110.
According to an embodiment of the present disclosure, since the indication 310 of the spatial layer is used instead of the RI and PMI, 1-bit overhead can be reduced for each record. At the same time, the indication of the transmission resource allocation type is more efficient than the transmission TM. Furthermore, jointly encoding the indication 310 of the space layer and the indication 320 of the resource allocation type may further reduce the 1-bit overhead for each record. Since at least 2-bit overhead is reduced for each record, system performance can be improved compared to current common DCI designs.
Fig. 4 illustrates a flow diagram of an example communication method 400 in accordance with certain embodiments of the present disclosure. It is to be appreciated that method 400 may be implemented, for example, at first terminal device 110 as shown in fig. 1. For ease of description, the method 400 is described below in conjunction with FIG. 1.
As shown, optionally, at 410, first terminal device 110 may receive a parameter set acquisition indication from network device 130 to determine whether to read the common DCI. At 420, the first terminal device 110 may receive a parameter set from the network device 130 indicating a resource allocation of the second terminal device 120. At 430, first terminal device 110 may receive a superimposed signal of a first signal specific to first terminal device 110 and a second signal specific to second terminal device 120 from network device 130.
At 440, first terminal device 110 may detect a first signal for first terminal device 110 from the received superimposed signal based at least in part on the spatial layer, the resource allocation type, the status of the resource allocation, and the power ratio indicated in the received parameter set.
According to the embodiment of the present disclosure, the first terminal device 110 may know, according to the parameter set, on which resources its own signal is interfered, and then may accordingly cancel the interference. The first terminal device 110 may detect the first signal by removing interference from the second signal using any suitable interference detection and/or cancellation technique now known and developed in the future. The scope of the present disclosure is not limited in this respect.
It should be understood that the operations and related features performed by the network device 130 described above in conjunction with the schematic diagram of fig. 3 are also applicable to the method 400 performed by the first terminal device 110, and have the same effects, and detailed details are not repeated.
Fig. 5 illustrates a block diagram of an apparatus 500 according to certain embodiments of the present disclosure. It is to be appreciated that the apparatus 500 may be implemented on the network device 130 side shown in fig. 1. As shown in fig. 5, apparatus 500 (e.g., network device 130) may support MUST for a first terminal device and a second terminal device. Note that it is still assumed here that the first terminal device is closer to the network device than the second terminal device.
The apparatus 500 comprises: a determining unit 510 configured to determine a set of parameters indicating a resource allocation of the second terminal device, the set of parameters may include: an indication of a spatial layer in the MUST for transmission by the second terminal device, an indication of a resource allocation type of the second terminal device, an indication of a status of resource allocation allocated to the second terminal device, and an indication of a power ratio selected by the second terminal device; a first transmitting unit 520 configured to broadcast a set of parameters in a cell of the apparatus 500; a second transmitting unit 520 configured to transmit a superimposed signal of the first signal specific to the first terminal device and the second signal specific to the second terminal device to the first terminal device.
In certain embodiments, the first transmission unit 520 includes a sub-unit configured to broadcast the parameter sets in the common DCI.
In some embodiments, the indication of the spatial layer may comprise at least 2 bits for indicating whether the second terminal device is configured on the first layer, the second layer, or both the first layer and the second layer in the MUST.
In some embodiments, the indication of the resource allocation type may comprise at least 2 bits for indicating that the resource allocation type of the second terminal device is resource allocation type 0, resource allocation type 1 or resource allocation type 2.
In some embodiments, the indication of the status of the resource allocation may comprise a plurality of bits which may indicate the resources allocated for the second terminal device in increasing order of frequency.
In some embodiments, the indication of the power ratio may comprise at least 2 bits for indicating the power ratio selected by the second terminal device.
In some embodiments, the apparatus 500 may further comprise: a third transmitting unit 540 configured to transmit, to the first terminal device, a parameter set acquisition indication indicating whether the first terminal device is paired for the MUST and whether resource allocation between the first terminal device and the paired second terminal device is aligned. In some embodiments, the third transmitting unit 540 may include a sub-unit that transmits the parameter set acquisition indication in downlink control information specific to the first terminal device.
Fig. 6 illustrates a block diagram of an apparatus 600 according to some embodiments of the present disclosure. It is understood that the apparatus 600 may be implemented on the side of the first terminal device 110 shown in fig. 1. Note that it is still assumed here that the first terminal device is closer to the network device than the second terminal device.
As shown, apparatus 600 (e.g., first terminal device 110) includes: a first receiving unit 610 configured to receive, from the network device, a parameter set indicating resource allocation of another terminal device, the parameter set may include: an indication of a spatial layer in the MUST for transmission by the other terminal device, an indication of a resource allocation type of the other terminal device, an indication of a status of resource allocation allocated to the other terminal device, and an indication of a power ratio selected by the other terminal device; a second receiving unit 620 configured to receive, from the network device, a superimposed signal of the first signal specific to the terminal device and another signal specific to another terminal device; and a detecting unit 640 configured to detect a first signal from the received superimposed signal based at least in part on the spatial layer, the resource allocation type, the state of the resource allocation, and the power ratio.
In some embodiments, the first receiving unit 610 may include a sub-unit that receives parameter sets in common DCI.
In some embodiments, the indication of the spatial layer may comprise at least 2 bits for indicating whether the second terminal device is configured on the first layer, the second layer, or both the first layer and the second layer in the MUST.
In some embodiments, the indication of the resource allocation type may comprise at least 2 bits for indicating that the resource allocation type of the second terminal device is resource allocation type 0, resource allocation type 1 or resource allocation type 2.
In some embodiments, the indication of the status of the resource allocation may comprise a plurality of bits which may indicate the resources allocated for the second terminal device in increasing order of frequency.
In some embodiments, the indication of the power ratio may comprise at least 2 bits for indicating the power ratio selected by the second terminal device.
In some embodiments, the apparatus 600 may further comprise: a third receiving unit 630, configured to receive, from the network device, a parameter set acquisition indication indicating that: whether the terminal device is paired for the MUST and whether the resource allocation between the terminal device and the other paired terminal device is aligned. In some embodiments, the third sending unit 540 may include a sub-unit that receives the parameter set acquisition indication in the terminal device specific downlink control information.
It should be understood that each unit recited in the apparatus 500 and the apparatus 600 corresponds to each step in the methods 300 and 400 described with reference to fig. 3-4, respectively. Therefore, the operations and features described above in connection with fig. 1 to 6 are equally applicable to the apparatus 500 and the apparatus 600 and the units included therein, and have the same effects, and detailed details are not repeated.
The elements included in apparatus 500 and apparatus 600 may be implemented in a variety of ways including software, hardware, firmware, or any combination thereof. In one embodiment, one or more of the units may be implemented using software and/or firmware, such as machine executable instructions stored on a storage medium. In addition to, or in the alternative to, machine-executable instructions, some or all of the elements in apparatus 500 and apparatus 600 may be implemented, at least in part, by one or more hardware logic components. By way of example, and not limitation, exemplary types of hardware logic components that may be used include Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standards (ASSPs), systems on a chip (SOCs), Complex Programmable Logic Devices (CPLDs), and so forth.
The elements shown in fig. 5 and 6 may be implemented partially or wholly as hardware modules, software modules, firmware modules, or any combination thereof. In particular, in some embodiments, the procedures, methods, or processes described above may be implemented by hardware in a network device or a terminal device. For example, a network device or a terminal device may implement methods 300 and 400 using its transmitter, receiver, transceiver, and/or processor or controller.
Fig. 7 illustrates a block diagram of a device 700 suitable for implementing embodiments of the present disclosure. Device 700 may be used to implement a network device, such as network device 130 shown in FIG. 1; and/or to implement a terminal device, such as the first terminal device 110 shown in fig. 1.
As shown, the device 700 includes a controller 710. The controller 710 controls the operation and functions of the device 700. For example, in certain embodiments, controller 710 may perform various operations by way of instructions 730 stored in a memory 720 coupled thereto. The memory 720 may be of any suitable type suitable to the local technical environment and may be implemented using any suitable data storage technology, including but not limited to semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems. Although only one memory unit is shown in FIG. 7, there may be multiple physically distinct memory units within device 700.
The controller 710 may be of any suitable type suitable to the local technical environment and may include, but is not limited to, one or more of general purpose computers, special purpose computers, microcontrollers, digital signal controllers (DSPs), and controller-based multi-core controller architectures. The device 700 may also include a plurality of controllers 710. The controller 710 is coupled to a transceiver 740, and the transceiver 740 may enable the reception and transmission of information by way of one or more antennas 750 and/or other components. Note that the transceiver 740 may be a separate device or may include separate devices for transmitting and receiving, respectively.
When the device 700 is acting as the network device 130, the controller 710 and the transceiver 740 may operate in cooperation to implement the method 300 described above with reference to fig. 3. When the device 700 is acting as the first terminal device 110, the controller 710 and the transceiver 740 may operate in cooperation, for example under the control of instructions 730 in the memory 720, to implement the method 400 described above with reference to fig. 4. For example, the transceiver 740 may perform operations related to the reception and/or transmission of data/information, while the controller 710 performs or triggers processing, computation, and/or other operations on the data. All of the features described above with reference to fig. 3 and 4 apply to the device 700 and are not described in detail here.
In general, the various example embodiments of this disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Certain aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While aspects of embodiments of the disclosure have been illustrated or described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
By way of example, embodiments of the disclosure may be described in the context of machine-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or divided between program modules as described. Machine-executable instructions for program modules may be executed within local or distributed devices. In a distributed facility, program modules may be located in both local and remote memory storage media.
Computer program code for implementing the methods of the present disclosure may be written in one or more programming languages. These computer program codes may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the computer or other programmable data processing apparatus, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. The program code may execute entirely on the computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on a remote computer or entirely on the remote computer or server.
In the context of this disclosure, a machine-readable medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More detailed examples of a machine-readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical storage device, a magnetic storage device, or any suitable combination thereof.
Additionally, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking or parallel processing may be beneficial. Likewise, while the above discussion contains certain specific implementation details, this should not be construed as limiting the scope of any invention or claims, but rather as describing particular embodiments that may be directed to particular inventions. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims (36)
1. A communication method implemented at a network device supporting multi-user superposition transmission, MUST, of a first terminal device and a second terminal device, the first terminal device being closer to the network device than the second terminal device, the method comprising:
determining a set of parameters indicative of a resource allocation of the second terminal device, the set of parameters comprising:
an indication of a spatial layer in the MUST for transmission by the second terminal device,
an indication of a resource allocation type of the second terminal device,
an indication of the status of the resource allocation allocated to the second terminal device, an
An indication of the power ratio selected by the second terminal device;
broadcasting the set of parameters in a cell of the network device; and
transmitting a superimposed signal of a first signal specific to the first terminal device and a second signal specific to the second terminal device to the first terminal device; and
sending a parameter set acquisition indication to the first terminal device indicating that:
whether the first terminal device is paired for the MUST, an
Whether the resource allocations between the first terminal device and the paired second terminal device are aligned,
wherein the parameter set acquisition indication is used to determine whether to read common downlink control information and to instruct the first terminal device to read the common downlink control information when resource allocation is not aligned.
2. The method of claim 1, wherein the indication of the spatial layer comprises at least 2 bits for indicating whether the second terminal device is configured on a first layer, a second layer, or both the first and second layers in the MUST.
3. The method according to claim 1, wherein the indication of the resource allocation type comprises at least 2 bits for indicating that the resource allocation type of the second terminal device is resource allocation type 0, resource allocation type 1 or resource allocation type 2.
4. The method of claim 1, wherein the indication of the status of resource allocation comprises a plurality of bits indicating the resources allocated for the second terminal device in increasing order of frequency.
5. The method according to claim 1, wherein the indication of the power ratio comprises at least 2 bits for indicating the power ratio selected by the second terminal device.
6. The method of claim 1, further comprising:
jointly encoding an indication of the spatial layer and an indication of the resource allocation type prior to broadcasting the parameter set.
7. The method of claim 6, wherein the indication of the jointly encoded spatial layer and the indication of the resource allocation type are collectively indicated by 3 bits.
8. The method of claim 1, wherein broadcasting the set of parameters comprises:
broadcasting the set of parameters in common downlink control information.
9. The method of claim 1, wherein sending the parameter set acquisition indication to the first terminal device comprises:
transmitting the parameter set acquisition indication in downlink control information specific to the first terminal device.
10. A communication method implemented at a terminal device that supports multi-user superposition transmission, MUST, of the terminal device and another terminal device, the terminal device being closer to a network device than the other terminal device, the method comprising:
receiving a set of parameters from the network device indicating a resource allocation of the other terminal device, the set of parameters comprising:
an indication of a spatial layer in the MUST for transmission by the other terminal device,
an indication of a resource allocation type of the further terminal device,
an indication of the status of the resource allocation allocated to the other terminal device, an
An indication of the power ratio selected by the other terminal device;
receiving, from the network device, a superimposed signal of a first signal specific to the terminal device and another signal specific to the other terminal device;
detecting the first signal from the received superimposed signal based at least in part on the spatial layer, the resource allocation type, the state of the resource allocation, and the power ratio; and
receiving, from the network device, a parameter set acquisition indication indicating:
whether the terminal device is paired for the MUST, an
Whether the resource allocation between the terminal device and the other terminal device of the pair is aligned,
wherein the parameter set acquisition indication is used to determine whether to read common downlink control information and, when resource allocation is not aligned, to instruct the terminal device to read the common downlink control information.
11. The method of claim 10, wherein the indication of the spatial layer comprises at least 2 bits for indicating whether the other terminal device is configured on a first layer, a second layer, or both the first and second layers in the MUST.
12. The method according to claim 10, wherein the indication of the resource allocation type comprises at least 2 bits for indicating that the resource allocation type of the other terminal device is resource allocation type 0, resource allocation type 1 or resource allocation type 2.
13. The method of claim 10, wherein the indication of the status of resource allocation comprises a plurality of bits indicating the resources allocated for the other terminal device in increasing order of frequency.
14. The method according to claim 10, wherein the indication of the power ratio comprises at least 2 bits for indicating the power ratio selected by the other terminal device.
15. The method of claim 10, wherein receiving the set of parameters from the network device further comprises:
receiving, from the network device, a parameter set in which the indication of the spatial layer and the indication of the resource allocation type are jointly encoded.
16. The method of claim 15, wherein the indication of the spatial layer and the indication of the resource allocation type that are jointly encoded are indicated by 3 bits.
17. The method of claim 10, wherein receiving the set of parameters comprises:
receiving the parameter set in common downlink control information.
18. The method of claim 10, wherein receiving the parameter set acquisition indication comprises:
receiving the parameter set acquisition indication in downlink control information specific to the first terminal device.
19. A network device that supports multi-user superposition transmission, MUST, of a first terminal device and a second terminal device, the first terminal device being closer to the network device than the second terminal device, the network device comprising:
a controller configured to:
determining a set of parameters indicative of a resource allocation of the second terminal device, the set of parameters comprising:
an indication of a spatial layer in the MUST for transmission by the second terminal device,
an indication of a resource allocation type of the second terminal device,
an indication of the status of the resource allocation allocated to the second terminal device, an
An indication of the power ratio selected by the second terminal device; and
a transceiver configured to:
broadcasting the set of parameters in a cell of the network device; and
transmitting a superimposed signal of a first signal specific to the first terminal device and a second signal specific to the second terminal device to the first terminal device,
wherein the transceiver is further configured to:
sending a parameter set acquisition indication to the first terminal device indicating that:
whether the first terminal device is paired for the MUST, an
Whether the resource allocations between the first terminal device and the paired second terminal device are aligned,
wherein the parameter set acquisition indication is used to determine whether to read common downlink control information and to instruct the first terminal device to read the common downlink control information when resource allocation is not aligned.
20. The apparatus of claim 19, wherein the indication of the spatial layer comprises at least 2 bits for indicating whether the second terminal device is configured on a first layer, a second layer, or both the first and second layers in the MUST.
21. The apparatus of claim 19, wherein the indication of the resource allocation type comprises at least 2 bits for indicating that the resource allocation type of the second terminal device is resource allocation type 0, resource allocation type 1, or resource allocation type 2.
22. The apparatus of claim 19, wherein the indication of the status of resource allocation comprises a plurality of bits indicating the resources allocated for the second terminal device in increasing order of frequency.
23. The apparatus of claim 19, wherein the indication of the power ratio comprises at least 2 bits for indicating the power ratio selected by the second terminal device.
24. The device of claim 19, wherein the controller is further configured to:
jointly encoding an indication of the spatial layer and an indication of the resource allocation type prior to broadcasting the parameter set.
25. The apparatus of claim 24, wherein the indication of the jointly encoded spatial layer and the indication of the resource allocation type are collectively indicated by 3 bits.
26. The device of claim 19, wherein the transceiver is further configured to:
broadcasting the set of parameters in common downlink control information.
27. The device of claim 19, wherein the transceiver is further configured to:
transmitting the parameter set acquisition indication in downlink control information specific to the first terminal device.
28. A terminal device that supports multi-user superposition transmission, MUST, of the terminal device and another terminal device, the terminal device being closer to a network device than the other terminal device, the terminal device comprising:
a transceiver configured to:
receiving a set of parameters from the network device indicating a resource allocation of the other terminal device, the set of parameters comprising:
an indication of a spatial layer in the MUST for transmission by the other terminal device,
an indication of a resource allocation type of the further terminal device,
an indication of the status of the resource allocation allocated to the other terminal device, an
An indication of the power ratio selected by the other terminal device; and
receiving, from the network device, a superimposed signal of a first signal specific to the terminal device and another signal specific to the other terminal device; and
a controller configured to:
detecting the first signal from the received superimposed signal based at least in part on the spatial layer, the resource allocation type, the state of the resource allocation, and the power ratio,
wherein the transceiver is further configured to:
receiving, from the network device, a parameter set acquisition indication indicating:
whether the terminal device is paired for the MUST, an
Whether the resource allocation between the terminal device and the other terminal device of the pair is aligned,
wherein the parameter set acquisition indication is used to determine whether to read common downlink control information and, when resource allocation is not aligned, to instruct the terminal device to read the common downlink control information.
29. The apparatus of claim 28, wherein the indication of the spatial layer comprises at least 2 bits for indicating whether the other terminal device is configured on a first layer, a second layer, or both the first and second layers in the MUST.
30. The apparatus of claim 28, wherein the indication of the resource allocation type comprises at least 2 bits for indicating that the resource allocation type of the other terminal device is resource allocation type 0, resource allocation type 1, or resource allocation type 2.
31. The apparatus of claim 28, wherein the indication of the status of resource allocation comprises a plurality of bits indicating the resources allocated for the other terminal device in increasing order of frequency.
32. The apparatus of claim 28, wherein the indication of the power ratio comprises at least 2 bits for indicating the power ratio selected by the other terminal device.
33. The device of claim 28, the transceiver further configured to:
receiving, from the network device, a parameter set in which the indication of the spatial layer and the indication of the resource allocation type are jointly encoded.
34. The apparatus of claim 33, wherein the indication of the spatial layer and the indication of the resource allocation type that are jointly encoded are indicated by 3 bits.
35. The device of claim 28, the transceiver further configured to:
receiving the parameter set in common downlink control information.
36. The device of claim 28, the transceiver further configured to:
receiving the parameter set acquisition indication in downlink control information specific to the terminal device.
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