TW201834488A - User device and method for wireless communication system - Google Patents

Abstract

A user device and a method for a wireless communication system are provided. The user device includes a processor and a transceiver. The processor is configured to determine a plurality of resource element group (REG) sets for at least one network node. The transceiver is configured to transmit the REG sets in a physical downlink control channel (PDCCH) to the at least one network node. The REG sets are allocated for the PDCCH having PDCCH candidates defined for at least one control channel element (CCE) aggregation level (AL). CCEs are allocated to a user device and includes a plurality of REGs. The REG sets including a set of the REGs are a mapping unit of the PDCCH candidates.

Description

 User device and method for wireless communication system  

The present invention relates to the field of communication systems, and more particularly to a network node, user device and method for a wireless communication system.

In long term evolution (LTE), physical channels of LTE can be classified into a downlink channel and an uplink channel. The downlink channel includes, for example, a physical downlink shared channel (PDSCH) and a physical downlink control channel (PDCCH). The uplink channel includes, for example, a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH).

The PDCCH is used to transmit downlink control information that informs the user equipment of resource allocation or scheduling related to downlink resource allocation on the PDSCH, the uplink resource grant, and the uplink power control command.

The PDCCH signal is designed to be demodulated at the user device based on a cell specific reference signal (CRS). However, the use of CRS does not take into account the increased complexity of the LTE system. The use of cell-specific reference signals can limit advanced techniques to increase cell capacity.

It is an object of the present invention to provide a network node, user device and method for a wireless communication system to balance channel estimation performance and various gains including frequency selective gain and time/frequency diversity gain.

A first aspect of the invention provides a network node for a wireless communication system. The network node includes a processor and a transceiver. The processor is configured to allocate a plurality of resource element group (REG) sets on a physical downlink control channel (PDCCH). The PDCCH has a plurality of candidate PDCCHs defining at least one control channel element (CCE) aggregation level (AL). A plurality of CCEs are assigned to a user device and include a plurality of REGs. The REG sets including a set of REGs are a mapping unit of the candidate PDCCHs. The processor is configured to map the REGs of the set of REGs to a continuous time and/or frequency resource. The transceiver is configured to transmit the PDCCH to the user device at a plurality of allocated resources.

According to an embodiment in combination with the first aspect of the invention, the processor is configured to map the set of REGs of the candidate PDCCHs to a frequency in a continuous or distributed manner.

According to an embodiment in combination with the first aspect of the invention, the processor is configured to map the sets of REGs of the candidate PDCCHs to time in a continuous manner.

According to an embodiment in combination with the first aspect of the present invention, the processor is configured to map the REG sets to a plurality of orthogonal frequency-division multiplexing (OFDM) in a time-first mapping manner a symbol, and the REG sets include a plurality of demodulation reference signals (DMRSs) on each of the REGs of the candidate PDCCHs.

According to an embodiment in combination with the first aspect of the invention, the REG set includes DMRSs for the candidate PDCCHs on a first OFDM symbol.

According to an embodiment in combination with the first aspect of the invention, the REG set includes DMRSs for the candidate PDCCHs on a second OFDM symbol.

According to an embodiment in combination with the first aspect of the invention, the REG set does not include DMRS for the candidate PDCCHs on a second OFDM symbol.

According to an embodiment in combination with the first aspect of the invention, the REG set includes DMRSs for the candidate PDCCHs on a third OFDM symbol.

According to an embodiment in combination with the first aspect of the invention, the REG set does not include DMRSs for the candidate PDCCHs on a fourth OFDM symbol.

According to an embodiment in combination with the first aspect of the present invention, the candidate PDCCHs are located in a nested structure, and the plurality of larger CCEs AL comprise a plurality of CCEs of a plurality of small CCEs.

According to an embodiment in combination with the first aspect of the invention, the processor is configured to map the sets of REGs in a time-first mapping, and the candidate PDCCHs are located in a nested structure.

According to an embodiment in combination with the first aspect of the invention, the processor is configured to map the sets of REGs in a frequency prioritized mapping, and the candidate PDCCHs are located in a nested structure.

A second aspect of the invention provides a user device for a wireless communication system. The user device includes a processor and a transceiver. The processor is configured to determine a plurality of REG sets for the at least one network node. The transceiver is configured to transmit the set of REGs in a PDCCH to the at least one network node. The REG sets are allocated on the PDCCH. The PDCCH has a plurality of candidate PDCCHs defining at least one CCE AL. A plurality of CCEs are assigned to the user device and include a plurality of REGs. The REG sets including a set of REGs are a mapping unit of the candidate PDCCFs. The processor is configured to map the REGs of the set of REGs to a continuous time and/or frequency resource.

In accordance with an embodiment in conjunction with the second aspect of the present invention, the transceiver is configured to receive the PDCCH to the user device over the plurality of allocated resources, and the transceiver is configured to transmit the set of REGs in the PDCCH.

According to an embodiment of the second aspect of the present invention, the processor is configured to map the REG sets of the candidate PDCCHs to a frequency in a continuous or distributed manner, or to select the candidates in a continuous manner The REG sets of the PDCCH are mapped to time.

According to an embodiment of the second aspect of the present invention, the processor is configured to map the REG sets to a plurality of orthogonal frequency-division multiplexing (OFDM) in a time-first mapping manner. a symbol, and the REG sets include a plurality of demodulation reference signals (DMRSs) on each of the REGs of the candidate PDCCHs.

According to an embodiment in combination with the second aspect of the invention, the REG set includes DMRSs for the candidate PDCCHs on a first OFDM symbol.

According to an embodiment in combination with the second aspect of the invention, the REG set includes DMRSs for the candidate PDCCHs on a second OFDM symbol.

According to an embodiment in combination with the second aspect of the invention, the REG set does not include DMRSs for the candidate PDCCHs on a second OFDM symbol.

According to an embodiment in combination with the second aspect of the invention, the REG set includes DMRSs for the candidate PDCCHs on a third OFDM symbol.

According to an embodiment in combination with the second aspect of the invention, the REG set does not include DMRSs for the candidate PDCCHs on a fourth OFDM symbol.

According to an embodiment in combination with the second aspect of the present invention, the candidate PDCCHs are located in a nested structure, and the plurality of larger CCEs AL comprise a plurality of CCEs of a plurality of small CCEs.

According to an embodiment in conjunction with the second aspect of the present invention, the processor is configured to map the REG sets in a time-first mapping, and the candidate PDCCHs are located in a nested structure.

According to an embodiment in conjunction with the second aspect of the present invention, the processor is configured to map the sets of REGs in a frequency prioritized mapping, and the candidate PDCCHs are located in a nested structure.

A third aspect of the invention provides a method for a network node of a wireless communication system. The method includes allocating a plurality of resource element group (REG) sets on a physical downlink control channel (PDCCH). The PDCCH has a plurality of candidate PDCCHs defining at least one control channel element (CCE) aggregation level (AL). A plurality of CCEs are assigned to a user device and include a plurality of REGs. The REG sets including a set of REGs are a mapping unit of the candidate PDCCHs. The method further includes mapping the REGs of the set of REGs to a continuous time and/or frequency resource.

According to an embodiment of the third aspect of the present invention, the method further includes mapping the REG sets of the candidate PDCCHs to a frequency in a continuous or distributed manner, or the candidate PDCCHs in a continuous manner. These REG sets are mapped to time.

According to an embodiment of the third aspect of the present invention, the method further comprises mapping the REG sets to a plurality of orthogonal frequency-division multiplexing (OFDM) symbols in a time-first mapping manner, and The REG sets include a plurality of demodulation reference signals (DMRSs) on each of the REGs of the candidate PDCCHs.

According to an embodiment in combination with the third aspect of the invention, the REG set includes DMRSs for the candidate PDCCHs on a first OFDM symbol.

According to an embodiment in conjunction with the third aspect of the invention, the REG set includes DMRSs for the candidate PDCCHs on a second OFDM symbol.

According to an embodiment in combination with the third aspect of the invention, the REG set does not include DMRSs for the candidate PDCCHs on a second OFDM symbol.

According to an embodiment in conjunction with the third aspect of the invention, the REG set includes DMRSs for the candidate PDCCHs on a third OFDM symbol.

According to an embodiment in conjunction with the third aspect of the present invention, the REG set does not include DMRSs for the candidate PDCCHs on a fourth OFDM symbol.

According to an embodiment in combination with the third aspect of the present invention, the candidate PDCCHs are located in a nested structure, and the plurality of larger CCEs AL comprise a plurality of CCEs of a plurality of small CCEs.

According to an embodiment in conjunction with the third aspect of the present invention, the method further comprises mapping the set of REGs in a time-first mapping, and the candidate PDCCHs are located in a nested structure.

According to an embodiment in combination with the third aspect of the invention, the method further comprises mapping the set of REGs in a frequency prioritized mapping, and the candidate PDCCHs are located in a nested structure.

A fourth aspect of the invention provides a method for a user device of a wireless communication system. The method includes determining a plurality of REG sets for at least one network node and transmitting the set of REGs in a PDCCH to at least one network node. The REG sets are allocated on the PDCCH. The PDCCH has a plurality of candidate PDCCHs defining at least one CCE AL. A plurality of CCEs are assigned to the user device and include a plurality of REGs. The REG sets including a set of REGs are a mapping unit of the candidate PDCCFs. The method further includes mapping the REGs of the set of REGs to a continuous time and/or frequency resource.

According to an embodiment in conjunction with the fourth aspect of the present invention, the method further comprises receiving the PDCCH to the user equipment on the plurality of allocated resources and transmitting the REG sets in the PDCCH.

According to an embodiment of the fourth aspect of the present invention, the method further includes mapping the REG sets of the candidate PDCCHs to a frequency in a continuous or distributed manner, or the candidate PDCCHs in a continuous manner. These REG sets are mapped to time.

According to an embodiment of the fourth aspect of the present invention, the method further comprises mapping the REG sets to a plurality of orthogonal frequency-division multiplexing (OFDM) symbols in a time-first mapping manner, and The REG sets include a plurality of demodulation reference signals (DMRSs) on each of the REGs of the candidate PDCCHs.

According to an embodiment in combination with the fourth aspect of the invention, the REG set includes DMRSs for the candidate PDCCHs on a first OFDM symbol.

According to an embodiment in combination with the fourth aspect of the invention, the REG set includes DMRSs for the candidate PDCCHs on a second OFDM symbol.

According to an embodiment in combination with the fourth aspect of the invention, the REG set does not include DMRSs for the candidate PDCCHs on a second OFDM symbol.

According to an embodiment in combination with the fourth aspect of the invention, the REG set includes DMRSs for the candidate PDCCHs on a third OFDM symbol.

According to an embodiment in combination with the fourth aspect of the invention, the REG set does not include DMRSs for the candidate PDCCHs on a fourth OFDM symbol.

According to an embodiment in combination with the fourth aspect of the present invention, the candidate PDCCHs are located in a nested structure, and the plurality of larger CCE ALs comprise a plurality of CCEs of a plurality of small CCEs.

According to an embodiment of the fourth aspect of the present invention, the method further comprises mapping the REG sets in a time-first mapping, and the candidate PDCCHs are located in a nested structure.

According to an embodiment in conjunction with the fourth aspect of the present invention, the method further comprises mapping the set of REGs in a frequency prioritized mapping, and the candidate PDCCHs are located in a nested structure.

In an embodiment of the present invention, the REG sets are a mapping unit of the candidate PDCCFs, and the processor is configured to map the REGs of the REG sets to a continuous time and/or frequency resource, to Balanced channel estimation performance and various gains including frequency selective gain and time/frequency diversity gain.

100‧‧‧Network node

102, 302‧‧‧ processor

104, 304‧‧‧ transceiver

106, 306‧‧‧ Antenna

200, 210‧‧‧ method

202, 204, 212, 214‧‧‧ blocks

300‧‧‧User device

500‧‧‧Wireless communication system

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in view of the drawings without departing from the scope of the invention.

1 is a block diagram of a network node for a wireless communication system in accordance with an embodiment of the present invention.

2A is a flow chart showing a method for a network node of a wireless communication system in accordance with an embodiment of the present invention.

2B is a flow chart showing a method for a user device of a wireless communication system in accordance with an embodiment of the present invention.

Figure 3 is a block diagram of a user device for a wireless communication system in accordance with an embodiment of the present invention.

4 is a diagram showing mapping of control channel elements (CCEs) in a distributed manner on the same orthogonal frequency-division multiplexing (OFDM) symbols according to an embodiment of the invention. schematic diagram.

Figure 5 shows a schematic diagram of mapping CCEs in a distributed manner over different OFDM symbols, in accordance with an embodiment of the present invention.

Figure 6 is a diagram showing a candidate downlink control channel (PDCCH) of a candidate entity according to an embodiment of the present invention.

FIG. 7 is a diagram showing a time-prioritized CCE mapping of a candidate PDCCH having a CCE aggregation level (AL) according to an embodiment of the present invention.

Figure 8 is a diagram showing a time-first CCE mapping of a candidate PDCCH with CCE AL, in accordance with an embodiment of the present invention.

Figure 9 is a diagram showing a time-first CCE mapping of a candidate PDCCH with CCE AL, in accordance with an embodiment of the present invention.

Figure 10 shows a schematic diagram of a time-first CCE mapping of a candidate PDCCH with CCE AL, in accordance with an embodiment of the present invention.

Figure 11 shows a schematic diagram of a nested structure for time-first CCE mapping, in accordance with an embodiment of the present invention.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which: FIG. In particular, the terms in the embodiments of the present invention are only used to describe certain embodiments and are not intended to limit the invention.

Referring to Figure 1, network node 100 is in communication with wireless communication system 500. The network node 100 includes a processor 102 and a transceiver 104. The processor 102 is in communication with the transceiver 104. Network node 100 can include one or more optional antennas 106 coupled to transceiver 104. The processor 102 is configured to allocate a plurality of resource element group (REG) sets on a physical downlink control channel (PDCCH). The PDCCH has a plurality of candidate PDCCHs defining at least one control channel element (CCE) aggregation level (AL). The number of plural CCEs is defined by at least one CCE AL. A plurality of CCEs are assigned to a user device 300 of the wireless communication system 500 (see FIG. 3) and include a plurality of REGs. A REG set can be, for example, a CCE. The REG sets including a set of REGs are a mapping unit of the candidate PDCCHs. The processor 102 is configured to map the REGs of the set of REGs to a continuous time and/or frequency resource. The transceiver 104 is configured to transmit a PDCCH to the user device 300 over a plurality of allocated resources.

The network node 100 or base station, for example, a radio base station (RBS) may be referred to as a transmitter such as an eNB, eNodeB, NodeB or Node B in some networks, depending on the communication technology and terminology used. The radio network node, based on the transmit power and the size of the cell, may be of different categories, for example, a macro eNodeB, a home eNodeB, or a pico eNodeB. The radio network node can be a station (STA). A station can be any device that interfaces with a wireless medium (WM) and that includes IEEE 802.11 compatible media access control (MAC) and physical layer (PHY).

Method 200 can be performed in network node 100 with reference to Figures 1 and 2A. The method 200 includes allocating a REG set on the PDCCH as shown in block 202, the PDCCH having a plurality of candidate PDCCHs defining at least one CCE AL and transmitting the PDCCH to the user device 300 on the allocated resources as indicated by block 204. The number of plural CCEs is defined by at least one CCE AL. A plurality of CCEs are assigned to the user device 300 and include a plurality of REGs. The REG sets including a set of REGs are a mapping unit of the candidate PDCCHs. The processor 102 is configured to map the REGs of the set of REGs to a continuous time and/or frequency resource.

Referring to Figures 2B and 3, method 210 can be performed in user device 300. The method 210 includes determining a plurality of REG sets for the at least one network node 100 as indicated by block 212 and transmitting the REG sets in the PDCCH to the at least one network node 100 as indicated by block 214. A REG set is allocated on the PDCCH. The PDCCH has a candidate PDCCH defining at least one CCE AL. A plurality of CCEs are assigned to the user device 300 and include a plurality of REGs. The REG sets including a set of REGs are a mapping unit of the candidate PDCCHs. The method 210 further includes mapping the REGs of the set of REGs to a continuous time and/or frequency resource.

Referring to FIG. 3, the user device 300 includes a processor 302 and a transceiver 304. Processor 302 is in communication with transceiver 304. In the present embodiment, user device 300 may also include one or more optional antennas 306 coupled to transceiver 304. The processor 302 of the user device 300 is configured to determine a plurality of REG sets for the at least one network node 100.

The transceiver 304 of the user device 300 receives uplink control information (UCI) from the processor 302 and is configured to transmit the set of REGs in the PDCCH to the network node 100. A REG set is allocated on the PDCCH. The PDCCH has a candidate PDCCH defining at least one CCE AL. The number of plural CCEs is defined by at least one CCE AL. A plurality of CCEs are assigned to the user device 300 and include a plurality of REGs. The REG sets including a set of REGs are a mapping unit of the candidate PDCCHs. The processor 302 is configured to map the REGs of the set of REGs to a continuous time and/or frequency resource. The transceiver 304 is configured to receive allocation information from at least one network node 100. The allocation information includes a frequency location and a quantity of at least one CCE AL. The transceiver 304 is configured to transmit a set of REGs in the PDCCH according to the allocation information.

In some embodiments, the REG packet is used as a mapping unit, where the REG packet includes 6 REGs. The REG set including a set of REGs is a mapping unit, and the REG set may be, for example, a CCE.

User device 300, for example, may be a mobile station, a wireless terminal, and/or a mobile terminal for communicating with wireless communication system 500, sometimes referred to as a cellular radio system. User device 300 may be further referred to as a wireless capable mobile phone, a cellular phone, a tablet or a laptop. The user device 300 can be, for example, a portable, pocket-type retractable, hand-held, computer- or car-mounted mobile device that can be accessed via a radio access network with another entity, such as another receiver or server. Voice and / or data communication. User device 300 can be a station (STA). A station can be any device that interfaces with a wireless medium (WM) and that includes IEEE 802.11 compatible media access control (MAC) and physical layer (PHY).

In the long term evolution (LTE) system of the fourth generation of mobile phone mobile communication technology standards (4G), the control region spans the entire system bandwidth and occupies in a subframe. The first few orthogonal frequency-division multiplexing (OFDM) symbols. The PDCCH is carried by one or a plurality of CCEs depending on the size of the payload and the quality of the channel. CCE also includes a plurality of REGs. The REGs of different PDCCHs are interleaved and spread throughout the control region (both time and frequency) to obtain time and frequency gain. The channel estimation is done based on a cell-specific reference signal (CRS) transmitted at a fixed location throughout the control region.

In a 5G new radio (NR) system, similar channel structures can be used for PDCCH, CCE, and REG. However, there are some new developments in the design of 5G NR PDCCH. For example, the CCE/REG may be mapped to the time/frequency region of the PDCCH (referred to as the set of control resources in the NR) in different ways. In the PDCCH, there may be a frequency priority mapping, or a time priority mapping or a combination of both. In addition to this, elements that map PDCCHs in a continuous or distributed manner are also supported. Each mapping approach has advantages and disadvantages in that it utilizes various gains such as time/frequency diversity gain, local frequency selective gain, and beamforming (BF) gain. Another aspect in which 5G NR differs from 4G LTE is the demodulation reference signal (DMRS) for PDCCH demodulation. The DMRS for the PDCCH is transmitted with the expected PDCCH, but is not transmitted across the entire control region. This requires a sufficient number of DMRSs to get a good channel estimate. A good mapping design needs to balance the need for these aspects, benefiting from the various gains mentioned above, and yielding good channel estimates for PDCCH decoding.

Since the PDCCH is carried by one or a plurality of CCEs, and the CCE further includes a plurality of REGs. There are different ways to do the mapping. For example, the REG of the PDCCH may span the time/frequency domain distribution of the control region to utilize time/frequency diversity similar to that in LTE. However, this may result in some channel estimation performance loss due to the limited number of DMRSs transmitted within the REG. In order to choose between the diversity gain and the channel estimation performance, the CCE can be used as a unit for the mapping of the distribution.

Referring to FIG. 4, an example in which each CCE is mapped to different frequency positions on the same OFDM symbol in a distributed manner, and REGs in the CCE are mapped together is shown. Such mapping has the advantage that the CCE is used as the smallest mapping unit, so the REG in the CCE (for example, as shown in the example, the CCE can contain 4 REGs) is allocated on consecutive resources, which can help the channel It is estimated that more DMRS can be used. The distributed CCE may benefit from the frequency diversity gain.

Referring to FIG. 5, in order to further utilize the diversity gain in time/frequency and allow power boost, by way of example, each CCE may be mapped to a different OFDM symbol.

Referring to Figure 6, another design criterion that needs to be considered in 5G NR is the reuse of channel estimation for decoding different candidate PDCCHs to reduce the overall PDCCH decoding effort. The nested structure as shown in FIG. 6 shows an example in which candidate PDCCHs of different CCE ALs align and share the same set of resources. This will allow reuse of channel estimates to decode different candidate PDCCHs.

The nested structure in Figure 6 can be seen as a logical structure, and the CCE can be further mapped onto the physical resources. The CCE mapping of the distribution as described in the frequency direction in Figures 4 and 5 can be used for this purpose as it maintains this nested structure and supports the reuse of channel estimation while utilizing beamforming and/or frequency diversity. Gain. However, for time-first REG/CCE mapping, this structure may require some modifications. Time-first mapping utilizes local frequency selective gain, allowing for power boosting while at the same time saving some DMRS burden and thus improving PDCCH performance. This is because if the resources for the PDCCH are contiguous in time, the DMRS on the second or third OFDM symbol can be omitted, thereby providing more resource elements (REs) for the PDCCH transmission.

Referring to Figure 7, an example of a time-first CCE/REG mapping is shown. In order to maintain a certain level of channel estimation performance, CCEs can be used in the mapping unit instead of REGs because CCEs contain more REGs and therefore have more DMRS to provide good channel estimates. The example in Figure 7 shows that the number of at least one CCE AL is equal to 1 (i.e., CCE AL = 1), and the user equipment includes all CCEs with DMRS for PDCCH decoding. Referring to FIG. 8, if the number of at least one CCE AL is greater than or equal to 2 (ie, CCE AL>=2), the CCE on the first OFDM symbol may include the DMRS, and the CCE on the second OFDM symbol does not carry the DMRS, There are more REs for the PDCCH. The channel estimate of the CCE on the second symbol can be obtained from the channel estimate of the CCE done on the first symbol, providing a sufficiently small channel variation in the time direction between the symbols. The example in FIG. 5 shows a mapping on a first OFDM symbol and a second OFDM symbol of a candidate PDCCH for CCE AL >= 2, but it may be extended for more OFDM symbols. Figure 9 shows an example of a time-first CCE mapping on four OFDM symbols for a candidate PDCCH with CCE AL >=2.

The above design may be generalized to map CCEs in the time direction (followed by frequency) to even-numbered OFDM symbols (eg, 2 or 4), where odd-numbered OFDM symbols (eg, first OFDM, third OFDM) The CCE carries the DMRS for channel estimation, while the CCEs on the even-numbered OFDM symbols (eg, the second OFDM, the fourth OFDM) do not carry the DMRS. If the total number of OFDM symbols in the control region (control resource set) is odd (eg, 3), such mapping may only be limited to a pair of 2 OFDM symbols. For example, on the first OFDM symbol and the second OFDM symbol, or on the second OFDM symbol and the third OFDM symbol. In another embodiment, the second OFDM symbol is the first symbol used for such mapping, the CCE on the second symbol carries the DMRS, and the third CCE does not carry the DMRS. The next generation node B (gNB) can configure those OFDM symbols for time-first mapping.

It should be mentioned that the columns of CCEs along the time direction as shown in Figs. 8 and 9 may be distributed continuously in frequency or in frequency.

As shown in Fig. 10, in one embodiment, the columns of CCEs along the time direction can be distributed in frequency, and thus can bring more frequency diversity. Referring to Fig. 11, a nested structure for time-first mapping is shown. It should be noted that the user equipment includes CCE numbers 2, 4, 6, and 8 (ie, CCE #2, CCE #4, CCE #6, and CCE #8), and does not include the candidate PDDCH for CCE AL>=2. DMRS. For candidate PDCCHs with CCE AL=1, the user equipment includes all CCEs with DMRS that can be used for channel estimation and candidate PDCCH decoding. However, since the DMRS assumptions for these candidate PDCCHs are different, the channel estimation obtained by decoding the candidate PDCCH with CCE AL=1 is not used for decoding of the candidate PDCCH with CCE AL>=2.

Using a nested structure as shown in Fig. 11, as part of the design criteria, time-prioritized CCE/REG mapping as shown in Figures 9 and 10 has some limitations in CCE mapping, and which CCE may contain DMRS And which does not contain DMRS. Such a restriction is to make a more consistent design for different candidate PDCCHs for different CCE ALs, and thus to result in similar/consistent performance, such as channel estimation when decoding different candidate PDCCHs. The nested structure also allows for reuse of channel estimates to decode different candidate PDCCHs with different CCE ALs, thereby reducing power consumption of the user device.

In an embodiment of the present invention, the REG sets are a mapping unit of the candidate PDCCFs, and the processor is configured to map the REGs of the REG sets to a continuous time and/or frequency resource, to Balanced channel estimation performance and various gains including frequency selective gain and time/frequency diversity gain.

Those of ordinary skill in the art will appreciate that each of the elements, algorithms, and steps described and disclosed in the embodiments of the present invention can be implemented in the form of an electronic hardware, or a combination of computer software and electronic hardware. The function performed in hardware or software depends on the application conditions and design requirements of the technical solution. Those skilled in the art can implement the functions in different ways for each specific application, and these implementations should not be considered to be beyond the scope of the present invention.

It will be understood by those skilled in the art that since the working processes of the system, device and unit are substantially the same, reference may be made to the working processes of the systems, devices and units in the above embodiments. For ease of description and brevity, these working processes will not be detailed.

It can be understood that the system, the device and the method disclosed in the embodiments of the present invention can be implemented in other manners. The above embodiments are merely exemplary. The division of the above units is only based on the division of logical functions, and there may be other divisions when implemented. Multiple units or elements may be combined or integrated into another system. Some features may also be ignored or skipped. In another aspect, the mutual coupling, direct coupling, or communication coupling shown or discussed can be through some interface, device, or unit operation, and can be an electrical, mechanical, or other form of indirect or communication operation.

The units as separate components for explanation may or may not be physically separate. The units for display may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be used in accordance with the purpose of the embodiments.

Furthermore, each functional unit in each embodiment may be integrated into one processing unit, and each unit may exist as a separate entity, or may also be integrated in one processing unit having two or more units.

If the software functional unit is implemented and used and sold as a product, the software functional unit can be stored in a readable storage medium of the computer. Based on such understanding, the technical solution proposed by the embodiments of the present invention may be embodied in the form of a software product substantially or partially. Alternatively, a part of the technical solution contributing to the conventional technology can be realized as a form of a software product. The software products in the computer are stored in a storage medium, including a plurality of commands for a computer device (such as a personal computer, a server, or a network device) to perform all or part of the steps disclosed in this embodiment. The storage medium includes a universal serial bus disk (USB disk), a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a floppy disk or a capable device. Other types of media that store code.

Although the present invention has been described in connection with what is considered to be the embodiment of the present invention, it is understood that the invention is not limited to the disclosed embodiments. Various configurations in the case of a wide range of interpretations.

Claims (10)

 A method for a user equipment of a wireless communication system, comprising: determining a plurality of resource element group sets for at least one network node; and transmitting the set of resource element groups in a physical downlink control channel to At least one network node, wherein the resource element group set is allocated on the physical downlink control channel, the entity downlink control channel having a plurality of candidate entities downlink control defining at least one control channel unit aggregation level Channels, a plurality of control channel units are allocated to the user device and include a plurality of resource element groups, wherein the resource element group sets including a group of resource element groups are a mapping unit of the candidate entity downlink control channels And the method further comprises mapping the resource element groups of the resource element group set to a continuous time and/or frequency resource.    The method of claim 1, further comprising receiving, by the plurality of allocated resources, the physical downlink control channel to the user equipment and transmitting the resource element group set in the physical downlink control channel. .    The method according to any one of claims 1 to 2, further comprising mapping the set of resource element groups of the candidate entity downlink control channels to a frequency in a continuous or distributed manner, or The contiguous manner maps the set of resource element groups of the candidate entity downlink control channels to time.    According to the method of claim 3, the method further includes: mapping the resource element group set to the plurality of orthogonal frequency division multiplexing symbols in a time-first mapping manner, and the resource element group sets are in the candidate entities. Each of the resource element groups of the downlink control channel includes a plurality of demodulation reference signals.    The method of claim 3, wherein the candidate entity downlink control channels are located in a nested structure, and the plurality of larger control channel unit aggregation levels comprise a plurality of small control channel unit aggregation levels Control channel unit.    According to the method of claim 3, the method further includes mapping the resource element group sets in a time priority mapping, and the candidate entity downlink control channels are located in a nest structure.    According to the method of claim 3, the method further includes mapping the resource element group sets in a frequency priority mapping, and the candidate entity downlink control channels are located in a nest structure.    A user device for a wireless communication system, comprising: a processor configured to determine a plurality of resource element group sets for at least one network node; and a transceiver configured to downlink an entity The set of resource element groups in the link control channel are transmitted to the at least one network node, wherein the resource element group set is allocated on the physical downlink control channel, the entity downlink control channel has at least one defined Controlling a plurality of candidate entity downlink control channels of the channel element aggregation level, the plurality of control channel units being allocated to the user device and including a plurality of resource element groups, wherein the resource element group sets of the group of resource element groups are included A mapping unit of the candidate entity downlink control channels, and the processor is configured to map the resource element groups of the resource element group sets to a continuous time and/or frequency resource.    The user device of claim 8 wherein the transceiver is configured to receive the physical downlink control channel on the plurality of allocated resources to the user device, and the transceiver is configured to use The set of resource element groups are transmitted in the physical downlink control channel.    The user device of any one of clauses 8 to 9, wherein the processor is configured to use the resource elements of the candidate entity downlink control channels in a continuous or distributed manner The set of sets is mapped to frequency, or the set of resource element groups of the candidate entity downlink control channels are mapped to time in a continuous manner.