CN113016220B

CN113016220B - Method, system and apparatus for digital wireless communication

Info

Publication number: CN113016220B
Application number: CN201880096661.5A
Authority: CN
Inventors: 贺海港; 郝鹏; 张晨晨
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2018-08-09
Filing date: 2018-08-09
Publication date: 2023-10-17
Anticipated expiration: 2038-08-09
Also published as: WO2020029172A1; CN113016220A

Abstract

The present disclosure relates to a method, system, and apparatus for digital wireless communication. A method of wireless communication based on selecting PDCCH candidate resources includes selecting a second set of resources from the first set of resources based on at least one of symbol direction, wake-up time, use of resources, or signaling. The method also includes performing wireless communications using at least one or more second set of resources.

Description

Method, system and apparatus for digital wireless communication

Technical Field

This patent application relates generally to digital wireless communications.

Background

Mobile communication technology has pushed the world to an increasingly social and networked society. The rapid growth and technological advances in mobile communication technology have led to greater demands for capacity and connectivity. Other aspects, such as energy consumption, equipment cost, spectral efficiency, and latency are also important to meet the needs of various communication schemes. Next generation systems and wireless communication technologies need to support deeper coverage and a larger number of connections than existing wireless networks.

Disclosure of Invention

The present application relates to methods, systems, and devices related to wireless communications, and more particularly, for selecting resources associated with control channel candidates, such as Physical Downlink Control Channel (PDCCH) candidates.

In one exemplary aspect, a method of wireless communication is disclosed. The method includes selecting a second set of resources from the first set of resources based on at least one of a symbol direction, a division of time slots, a use of resources, or signaling. The method also includes performing physical channel-based wireless communication using at least one or more second set of resources.

In some embodiments, the first set of resources includes a plurality of Physical Downlink Control Channel (PDCCH) candidates corresponding to one or more sets of search spaces. In some embodiments, the second set of resources includes a subset of the plurality of PDCCH candidates.

In some embodiments, performing wireless communication includes: one or more PDDCH candidates are selected from the second set of resources, and one or more Downlink Control Information (DCI) is transmitted using the selected one or more PDDCH candidates.

In some embodiments, selecting the second set of resources is based at least in part on at least one of: the total number of blind detections of PDCCH candidates corresponding to the second set of resources, the total number of Control Channel Elements (CCEs) associated with the PDCCH candidates of the second set of resources. In some embodiments, neither the total number of blind detections of PDCCH candidates corresponding to the second set of resources nor the total number of CCEs associated with the PDCCH candidates of the second set of resources exceeds a respective threshold value. In some embodiments, one or more target PDCCH candidates included in the second set of resources are excluded from the PDCCH candidates for the purpose of determining at least one of a total number of blind detections and a total number of CCEs, wherein the one or more target PDCCH candidates are used to inform at least one of: (a) Terminal wake-up information, (b) downlink control information associated with terminal wake-up.

In some embodiments, the time slot in which the at least one PDCCH candidate for terminal wakeup is located includes a plurality of divided time slots. In some embodiments, selecting the second set of resources includes selecting one or more PDCCH candidates in a first partitioned slot of the slot based at least in part on a first rule. In some embodiments, the first rule includes at least one of: only selecting one or more wake-up physical downlink control channel (WUP) PDCCH candidates for addition to the second set of resources; only (a) one or more wake up WUP PDCCH candidates and (b) one or more PDCCH candidates for informing of slot formats are selected to be added to the second set of resources. In some embodiments, selecting the second set of resources includes selecting one or more PDCCH candidates in a second partitioned slot of the slot based at least in part on a second rule. In some embodiments, the second rule comprises: one or more PDCCH candidates are selected for inclusion in the second group according to an order of at least one of a search space set type or a search space set index.

In some embodiments, selecting the second set of resources based on the symbol direction comprises: one or more PDCCH candidates overlapping with one or more symbols indicated as uplink symbols are excluded from the second set of resources.

In some embodiments, selecting the second set of resources based on the symbol direction comprises: one or more PDCCH candidates overlapping one or more symbols indicated as flexible symbols are excluded from the second set of resources.

In some embodiments, selecting the second set of resources based on the symbol direction comprises: in the case that the set of search spaces includes at least one PDCCH candidate overlapping one or more symbols indicating uplink symbols, all PDCCH candidates in the set of search spaces are excluded from the second set of resources.

In some embodiments, selecting the second set of resources based on the symbol direction comprises: in the case that the set of search spaces includes at least one PDCCH candidate overlapping one or more symbols indicating flexible symbols, all PDCCH candidates in the set of search spaces are excluded from the second set of resources.

In some embodiments, selecting the second set of resources comprises selecting one or more PDCCH candidates from the plurality of USS sets based on at least one of: preferably selecting one or more PDCCH candidates from a first subset of a plurality of user specific search space (USS) sets, wherein each USS set of the plurality of USS combinations comprises at least one WUP PDCCH candidate; one or more PDCCH candidates are selected from a second subset of the plurality of USS sets according to the search space set ID, wherein the second subset of USS sets is any USS set excluding the first subset.

In some embodiments, selecting the second set of resources includes, where the USS set includes one or more WUP PDCCH candidates, preferably selecting at least one WUP PDCCH candidate within the USS set.

In some embodiments, selecting the second set of resources includes performing at least one of the following in a slot including at least one WUP PDCCH candidate: selecting only one or more WUP PDCCH candidates; selecting only (a) one or more WUP PDCCH candidates and (b) one or more PDCCHs included in one or more Common Search Space (CSS) sets; selecting only (a) one or more PDCCHs of one or more search space sets and (b) one or more PDCCH candidates included in one or more CSS sets, wherein each of the search space sets includes at least one WUP PDCCH candidate; or selecting only (a) one or more WUP PDCCH candidates and (b) one or more PDCCHs for informing a Slot Format Indication (SFI).

In some embodiments, the first set of resources is divided into a plurality of resources according to one or more predetermined rules, and the base station forms the second set of resources by signaling one or more resource indices.

In some embodiments, the base station indicates the second set of resources based at least in part on the first set of resources by signaling, wherein the signaling includes at least one of: higher layer signaling, MAC CE, physical downlink control signaling, at least one sequence. In some embodiments, the second set of resources is indicated at least in part by at least one of: index of the sequence, cyclic shift of the sequence, time-frequency resource position occupied by the sequence.

In some embodiments, performing wireless communication includes: one or more PDCCHs are monitored based at least in part on the subset of the second set of resources. In some embodiments, monitoring one or more PDCCHs includes at least one of: blind detection, CCE estimation.

In another exemplary aspect, a wireless communication device is disclosed that is configurable or operable to perform the method described above.

In another exemplary aspect, the method described above is implemented in the form of processor-executable code and stored in a computer-readable program medium.

The above and other aspects and implementations thereof will be described in more detail in the accompanying drawings, description and claims.

Drawings

Fig. 1 is a flow chart illustrating an exemplary flow of communications by a base station side based on selected resources, in accordance with some embodiments of the disclosed technology.

Fig. 2 is a flow chart illustrating an exemplary flow of communication by a terminal side based on selected resources, in accordance with some embodiments of the disclosed technology.

Fig. 3-11 illustrate examples of search space configurations in accordance with various embodiments of the disclosed technology.

Fig. 12 illustrates an example of a wireless communication system in which one or more embodiments in accordance with the disclosed technology may be applied.

Fig. 13 is a block diagram schematic of a portion of a radio station.

Detailed Description

Examples of techniques and applications herein may be used to improve performance of a multi-user wireless communication system. The term "exemplary" is used to express an instance of … … and does not indicate an ideal or preferred embodiment unless otherwise stated. The section headings are used to facilitate an understanding of this patent application, and do not limit the technology disclosed in the section to only that in the corresponding section.

In wireless communication systems, such as Long Term Evolution (LTE) and new generation radio access technology (NR) systems, downlink control information is carried by a Physical Downlink Control Channel (PDCCH). Typically, the base station selects one PDCCH candidate among a plurality of PDCCH candidates as a final PDCCH channel. The associated terminal (e.g., user terminal, UE) does not know which PDCCH candidate of the plurality of PDCCH candidates the base station selects as the final PDCCH channel. Therefore, the terminal needs to perform PDCCH demodulation and decoding of individual PDCCH candidates until the final PDCCH channel is successfully found.

The plurality of PDCCH candidates described above are typically distributed over a plurality of aggregation levels. Each aggregation level typically includes a plurality of PDCCH candidates. The aggregation level typically refers to the number of Control Channel Elements (CCEs) included in the PDCCH candidate. For example, if the aggregation level is 4, each PDCCH candidate of the aggregation level includes 4 CCEs. For example, in NR, one CCE includes 6 Resource Element Groups (REGs), and one REG includes 12 Resource Elements (REs). It follows that a larger number of PDCCH candidates may lead to blind detection of a larger number of PDCCH candidates by the terminal, and thus to more CCE channel estimates.

The control resource set (CORESET) is mainly used to determine a frequency domain in which the base station transmits the PDCCH and the terminal detects the PDCCH and to determine the number of symbols occupied by the PDCCH channel. The search space set is mainly used to determine which aggregation level PDCCHs can be used, the number of PDCCH candidates for a specific aggregation level, and information such as the period and time domain location of the PDCCHs.

In the above text, various topics may appear. In one aspect, the periodicity of different sets of search spaces may be different. When multiple search space sets are located in the same slot, the total number of PDCCH candidates on the slot will increase significantly, and thus the number of PDCCH blind detections by the terminal and the number of CCEs requiring channel estimation will also increase significantly. Thus, at least one of the total number of PDCCH candidates and the total number of CCEs requiring channel estimation on all spatial sets may exceed the capability supported by a User Equipment (UE) terminal. On the other hand, if the number of PDCCH candidates included in one search space set is relatively small, the PDCCH candidates allocated to one terminal in the search space set may have a resource collision problem with the PDCCH candidates of another terminal. In this case, the PDCCH candidates for one terminal in the search space set may be occupied by other terminals, resulting in no PDCCH candidate resources being available in the search space set for use by the terminal.

The techniques of the present disclosure address these issues. In some aspects, the base station and the terminal may discard some PDCCH candidates according to the same rules, such that the reserved (i.e., non-discarded) PDCCH candidates do not exceed the capabilities of the terminal. For example, the rules for the base station and terminal to select PDCCH candidates may be:

1) Based on symbol direction, e.g., discarding PDCCH candidates containing at least one of uplink symbols and flexible symbols;

2) A PDCCH candidate for waking up only a PDCCH (WUP) is reserved based on a wake-up time, for example, in a non-wake-up (or sleep) time in a slot, and a PDCCH resource in a Common Search Space (CSS) set is reserved first, a PDCCH resource in a UE-specific search space (USS) set is reserved second, and a PDCCH candidate is reserved in an ascending order of USS set IDs within the USS set in the wake-up time in the slot; or (b)

3) The WUP PDCCH candidates are reserved first, then the other PDCCH candidates are reserved.

The base station selects one or more PDCCH candidates from the reserved PDCCH candidates, and transmits downlink control information to the terminal using the selected PDCCH.

In some aspects, the base station may signal the location of the PDCCH candidates in the set of search spaces. In other aspects, the location of the PDCCH candidate in the set of search spaces may be determined by two rules (e.g., two hash functions). In this way, and by properly designing the location of the PDCCH candidates in the set of search spaces, the probability of resource collision is reduced.

Fig. 1 is a flow chart illustrating an exemplary flow of communications by a base station side based on selected resources, in accordance with some embodiments of the disclosed technology. Referring to fig. 1, in block 102, a base station determines a first set of resources. For example, the first set of resources may be (a) a plurality of PDCCH candidates corresponding to time slot n and configured by the base station for the terminal, or (b) time-frequency resources corresponding to CORESET in the time slot.

At block 104, the base station selects a second set of resources from the first set of resources. For example, if the first set of resources is (a), the base station selects a PDCCH candidate from the PDCCH candidate set for slot n according to an appropriate rule to reserve the selected PDCCH candidate as the second set of resources. For example, if the first set of resources is (b), then the base station selects one or more resources (according to appropriate rules) from the range of time-frequency resources that indicate or calculate CORESET in the corresponding time slot as reserved PDCCH candidate resources (i.e., the second set of resources).

In block 106, the base station selects one or more resources from the second set of resources for the purpose of the PDCCH. At block 108, the base station transmits Downlink Control Information (DCI) to at least one terminal over the selected one or more PDCCHs.

Fig. 2 is a flow chart illustrating an exemplary terminal-side flow of communicating based on selected resources, in accordance with some embodiments of the disclosed technology. Referring to fig. 2, at block 202, a terminal determines a first set of resources. For example, the first set of resources may be (a) a plurality of PDCCH candidates corresponding to time slot n and configured by the base station, or (b) time-frequency resources corresponding to CORESET in the time slot.

In block 204, the terminal selects a second set of resources from the first set of resources. For example, if the first set of resources is (a), the terminal selects a PDCCH candidate from the PDCCH candidate set for slot n according to an appropriate rule (e.g., the same rule used by the base station associated with the terminal) to reserve the selected PDCCH candidate as the second set of resources. For example, if the first set of resources is (b), the terminal selects one or more PDCCH candidate resources from the first set of resources as reserved PDCCH candidate resources (i.e., the second set of resources) as indicated by the base station or based on calculations according to appropriate rules.

In block 206, the terminal monitors the PDCCH based on the second set of resources (i.e., the PDCCH candidates selected for reservation).

Example embodiment 1

In some embodiments, the reserved PDCCH candidates are selected based on symbol direction. For example, PDCCH candidates overlapping one or more uplink symbols are not selected as reserved PDCCH candidates. For example, PDCCH candidates overlapping one or more flexible symbols are not selected as reserved PDCCH candidates.

The base station configures a set of search spaces for the terminal. The set of configured search spaces may include a set of Common Search Spaces (CSSs) and a set of UE-specific search spaces (USSs). As shown in fig. 3, for single carrier scheduling, the base station configures one set of CSSs and two sets of USSs for the terminal, according to some embodiments. By way of example, the aggregation level and number of PDCCH candidates included in the CSS set are shown in fig. 3, and the corresponding positions of the PDCCH candidates in the slot n are shown in fig. 4. In fig. 4, 'D' represents a fixed downlink symbol, 'X' represents a flexible symbol and 'U' represents a fixed uplink symbol. Flexible symbols may be used for downlink or uplink transmissions.

With continued reference to fig. 4, the css set is configured as follows:

one PDCCH monitoring time is arranged in a PDCCH monitoring time slot, the initial symbol index of the monitoring time in the monitoring time slot is symbol 0, and each PDCCH candidate time domain occupies 2 symbols; and is also provided with

There are 2 PDCCH candidate aggregation levels l=4.

By way of example, the aggregation level and number of PDCCH candidates included in USS set 1 are shown in fig. 3, while the corresponding positions of the PDCCH candidates in slot n are shown in fig. 5. In fig. 5, 'D' represents a fixed downlink symbol, 'X' represents a flexible symbol, and 'U' represents a fixed uplink symbol. Flexible symbols may be used for downlink or uplink transmissions.

With continued reference to fig. 5, uss set 1 is configured as follows:

two PDCCH monitoring moments exist in a PDCCH monitoring time slot, the initial symbol indexes of the two monitoring moments in the monitoring time slot are respectively a symbol 0 and a symbol 8, and each PDCCH candidate time domain occupies 2 symbols; and is also provided with

For each PDCCH monitoring instant, there are 3 PDCCH candidate aggregation levels l=2.

By way of example, the aggregation level and number of PDCCH candidates included in USS set 2 are shown in fig. 3, while the corresponding positions of the PDCCH candidates in slot n are shown in fig. 6. In fig. 6, 'D' represents a fixed downlink symbol, 'X' represents a flexible symbol, and 'U' represents a fixed uplink symbol. Flexible symbols may be used for downlink or uplink transmissions.

With continued reference to fig. 6, css set 2 is configured as follows:

There are 2 PDCCH candidate aggregation levels l=2; and is also provided with

There are 3 PDCCH candidate aggregation levels l=4.

The base station first selects PDCCH candidates from the CSS set and then from the USS set for reservation until at least one of the number of PDCCH blind detections corresponding to the selected PDCCH candidates and the number of CCEs corresponding to the selected PDCCH candidates reaches or exceeds a threshold value. As a whole, all PDCCH candidates included in one search space set having only downlink symbols are selected as reserved PDCCH candidates or discarded.

The base station selects PDCCH candidates based on symbol directions, wherein the symbol directions include downlink symbols, uplink symbols, and flexible symbols. A downlink symbol may mean that the transmission direction of the symbol is fixed to be downlink. An uplink symbol may mean that the transmission direction of the symbol is fixed as uplink. Flexible symbols may mean that the direction of transmission of the symbols may be uplink or downlink. The symbol direction may be determined based on the indication signaling. For example, the symbol direction may be indicated by higher layer signaling or physical layer signaling.

In these embodiments, PDCCH candidates overlapping at least one of the uplink symbol or the flexible symbol are not selected as reserved PDCCH candidates. When the base station selects the PDCCH candidates in a specific order, the PDCCH candidates overlapping with at least one of the uplink symbols or the flexible symbols may be skipped.

Based on the above description, an exemplary procedure for selecting reserved PDCCH candidates is discussed below. The base station first selects 2 PDCCH candidates of aggregation level 4 in the CSS set. The 2 selected PDCCH candidates do not include uplink symbols or flexible symbols, and thus the 2 PDCCH candidates are selected as reserved PDCCH candidates.

After selecting a PDCCH candidate from the CSS set, the base station selects a PDCCH candidate from the USS set. The base station selects PDCCH candidates in ascending order of USS set IDs. Thus, the base station first selects a PDCCH candidate from USS set 1. As shown in fig. 5, in slot n, 3 PDCCH candidates at time 1 include uplink symbols, so the base station skips or discards them. The base station selects only 3 PDCCH candidates from among 3 PDCCH candidates at time 0 to add to the reserved PDCCH candidates. Thus, when the number of PDCCH blind detections corresponding to the selected PDCCH candidate and the number of CCEs corresponding to the selected PDCCH candidate each do not exceed an appropriate threshold, the base station may select 3 PDCCH candidates at time 0 as further reserved PDCCH candidates in USS set 1.

After the base station selects 3 PDCCH candidates at time 0 in USS set 1 as some reserved PDCCH candidates, the base station continues to select PDCCH candidates from USS set 2. As shown in fig. 6, because one PDCCH candidate in USS set 2 overlaps with an uplink symbol or flexible symbol, when the number of PDCCH blind detections corresponding to the selected PDCCH candidate and the number of CCEs corresponding to the selected PDCCH candidate each do not exceed a threshold value, all PDCCH candidates in USS set 2 are also selected as reserved PDCCH candidates.

The base station then selects one or more PDCCH candidates among the reserved PDCCH candidates as a PDCCH used by the base station to transmit Downlink Control Information (DCI) to at least one terminal.

At least one terminal may select a PDCCH candidate for reservation according to the same rules used by the base station and monitor the PDCCH for communication with the base station based on the reserved PDCCH candidate (e.g., a second set of resources).

Example embodiment 2

In some embodiments, the reserved PDCCH candidates are selected based on symbol direction. For example, if the search space set includes at least one PDCCH candidate overlapping one or more uplink symbols, then none of the PDCCH candidates in the search space set are selected as reserved PDCCH candidates. For example, if the search space set includes at least one PDCCH candidate overlapping one or more flexible symbols, then none of the PDCCH candidates in the search space set are selected as reserved PDCCH candidates.

The base station configures a set of search spaces for the terminal. The set of configured search spaces may include a set of Common Search Spaces (CSSs) and a set of UE-specific search spaces (USSs). As shown in fig. 3, for single carrier scheduling, the base station configures one set of CSSs and two sets of USSs for the terminal, according to some embodiments. By way of example, the aggregation level and number of PDCCH candidates included in the CSS set are shown in fig. 3, and the corresponding positions of the PDCCH candidates in the slot n are shown in fig. 4. In fig. 4, 'D' represents a fixed downlink symbol, 'X' represents a flexible symbol, and 'U' represents a fixed uplink symbol. Flexible symbols may be used for downlink or uplink transmissions.

With continued reference to fig. 4, the css set is configured as follows:

There are 2 PDCCH candidate aggregation levels l=4.

With continued reference to fig. 5, uss set 1 is configured as follows:

By way of example, the aggregation level and number of PDCCH candidates included in USS set 2 are shown in fig. 3, while the corresponding positions of the PDCCH candidates in slot n are shown in fig. 6. In fig. 6, 'D' represents a fixed downlink symbol, 'X' represents a flexible symbol and 'U' represents a fixed uplink symbol. Flexible symbols may be used for downlink or uplink transmissions.

With continued reference to fig. 6, css set 2 is configured as follows:

one PDCCH monitoring time is arranged in a PDCCH monitoring time slot, the initial symbol index of the monitoring time in the monitoring time slot is symbol 0, and each PDCCH candidate time domain occupies 2 symbols;

there are 2 PDCCH candidate aggregation levels l=2; and is also provided with

There are 3 PDCCH candidate aggregation levels l=4.

In these embodiments, if the USS set includes at least one PDCCH candidate overlapping at least one of an uplink symbol or a flexible symbol, then all PDCCH candidates of the USS set are discarded and not selected as reserved PDCCH candidates. When the base station selects PDCCH candidates in a particular order of the set of search spaces, the base station may skip a set of USSs having at least one PDCCH candidate overlapping with at least one of the uplink symbols and the flexible symbols.

After selecting a PDCCH candidate from the CSS set, the base station selects a PDCCH candidate from the USS set. The base station selects PDCCH candidates in ascending order of USS set IDs. Thus, the base station first selects a PDCCH candidate from USS set 1. As shown in fig. 5, in slot n, the 3 PDCCH candidates at time 1 include uplink symbols, so the base station skips the entire USS set 1. In other words, the base station does not select any PDCCH candidate or USS set 1 as the reserved PDCCH candidate.

After processing USS set 1, the base station continues to select PDCCH candidates from USS set 2. As shown in fig. 6, because one PDCCH candidate in USS set 2 overlaps with an uplink symbol or flexible symbol, when the number of PDCCH blind detections corresponding to the selected PDCCH candidate and the number of CCEs corresponding to the selected PDCCH candidate each do not exceed a threshold value, all PDCCH candidates in USS set 2 are also selected as reserved PDCCH candidates.

At least one terminal may select a PDCCH candidate for reservation according to the same rules as used by the base station and monitor the PDCCH for communication with the base station based on the reserved PDCCH candidate (e.g., a second set of resources).

Example embodiment 3

In some embodiments, a slot including one or more wake PDCCH (WUP) PDCCH candidates may be divided into a wake-on-active time and a wake-off-active time (or sleep time). In a wake-up inactive time of a slot, PDCCH candidates for reservation may be selected based on a first rule; in the wake-up effective time of the slot, PDCCH candidates for reservation may be selected based on a second rule.

The base station configures a set of search spaces for the terminal. The set of configured search spaces may include a set of Common Search Spaces (CSSs) and a set of UE-specific search spaces (USSs). As shown in fig. 7, for single carrier scheduling, the base station configures two sets of CSSs and two sets of USSs for the terminal, according to some embodiments.

As shown in fig. 7, for CSS set 0, the base station configures one PDCCH candidate. For CSS set 1, the base station configures two PDCCH candidates. For USS set 2, the base station configures 2 PDCCH candidates. For USS set 3, the base station configures 3 PDCCH candidates. Of these PDCCH candidates, 2 PDCCH candidates included in USS set 2 are WUP PDCCH candidates, while other PDCCH candidates are used for other purposes.

WUP is a physical downlink control channel for informing a terminal of wake-up information or for informing a notified or awakened terminal of related downlink control information. The base station selects one or more WUP PDCCH candidates as a WUP channel for transmitting wake-up information to the terminal or transmitting some downlink control information required for downlink reception after wake-up to the terminal that has been informed of the wake-up. If the terminal is notified to wake up, it means that the terminal will receive communications on at least some of the non-WUP physical downlink channels. If the terminal is not notified to wake up, the terminal does not receive communications on at least some of the non-WUP physical downlink channels.

In time slot n of fig. 7, the t1 time period is wake-up inactive time, and the t2 time period is wake-up active time. Wake-up non-effective time generally refers to the period of time during which the terminal is not awake. Wake-up validation time generally refers to the period of time that the terminal wakes up to validate. The terminal is informed of the wake-up by means of the associated wake-up signal and wake-up channel. For example, WUP is a physical downlink control channel for informing a terminal of wake-up information or a physical downlink control channel for informing a notified or wake-up terminal of related downlink control information.

In these embodiments, the base station reserves PDCCH candidates based on wake-up active/inactive time selections. In the wake-up non-effective time, the base station selects PDCCH candidates according to a first rule; and in the wake-up effective time, the base station selects the PDCCH candidate according to a second rule.

By way of example, the first rule is:

selecting only WUP PDCCH candidates for reservation; or (b)

Only (a) WUP PDCCH candidates and (b) PDCCH candidates for informing of slot formats are selected for reservation.

By way of example, the second rule is:

the PDCCH candidates are selected based on an order of at least one of a search space set type and a search space set index.

Referring to fig. 7, the base station first selects a PDCCH candidate according to a first rule in a wake-up non-effective time t 1. For example, the first rule is to select only WUP PDCCH candidates as reserved PDCCH candidates. In this case, the base station selects 2 PDCCH candidates in USS set 2 as reserved PDCCH candidates.

Then, in wake-up effective time t2, the base station selects a PDCCH candidate according to a second rule. For example, the second rule is that the base station preferably selects PDCCH candidates from a set of search spaces of the CSS type, and then selects PDCCH candidates from a set of search spaces of the USS type, and for each search space type, the base station selects PDCCH candidates in ascending order of the search space set ID.

Based on the above description, during wake-up validation time t2, the base station first selects a PDCCH candidate from CSS set 0 and then selects a PDCCH candidate from USS set 3. For example, a PDCCH candidate is selected as a reserved PDCCH candidate in CSS set 0, and the number of monitored PDCCH candidates corresponding to all reserved PDCCH candidates and the number of CCEs corresponding to reserved PDCCH candidates each do not exceed an appropriate threshold. However, if a PDCCH candidate is also selected as a reserved PDCCH candidate in USS set 3, at least one of the number of monitored PDCCH candidates corresponding to all reserved PDCCH candidates and the number of CCEs corresponding to reserved PDCCH candidates may exceed a threshold value. Therefore, in wake-up effective time t2, the base station selects only PDCCH candidates in CSS set 0 as reserved PDCCH candidates.

The base station then selects one or more PDCCH candidates from among the reserved PDCCH candidates as a PDCCH channel for the base station to transmit Downlink Control Information (DCI) to at least one terminal.

Example embodiment 4

In some embodiments, the order in which the PDCCH candidates are selected from the USS set is based on two methods:

the PDCCH candidates are preferably retained in a USS set comprising WUP PDCCH candidates; and

for other USS sets, PDCCH candidates are selected for reservation based on the ascending order of the search space set IDs.

The base station configures a set of search spaces for the terminal. The set of configured search spaces may include a set of Common Search Spaces (CSSs) and a set of UE-specific search spaces (USSs). As shown in fig. 8, for single carrier scheduling, the base station configures one set of CSSs and three sets of USSs for the terminal, according to some embodiments.

As shown in fig. 8, for the CSS set, the base station configures 2 PDCCH candidates. For USS set 1, the base station configures 3 PDCCH candidates. For USS set 2, the base station configures 4 PDCCH candidates, including 2 PDCCH candidates as WUP PDCCH candidates and 2 non-WUP PDCCH candidates. For USS set 3, the base station configures 2 PDCCH candidates.

In some embodiments, the base station sequentially selects PDCCH candidates for reservation according to an appropriate set of search spaces. Depending on the selection order, the USS set including the WUP PDCCH candidates has a higher priority than the other USS sets. For other USS sets, the base station selects PDCCH candidates in ascending order of search space set IDs. In some embodiments, all PDCCH candidates in the search space set are selected as reserved PDCCH candidates, or discarded.

Based on the above description, a flow example for selecting a PDCCH candidate is discussed below. The base station first selects 2 PDCCH candidates in the CSS set as reserved PDCCH candidates according to the order "first CSS then USS". The base station then selects PDCCH candidates from the USS set to reserve. In the USS set, the base station preferably selects a PDCCH candidate from a USS set containing WUP PDCCH candidates. Thus, when at least one of the number of monitored PDCCH candidates corresponding to the reserved PDCCH candidates and the number of CCEs corresponding to the reserved PDCCH candidates does not exceed an appropriate threshold, the base station selects 4 PDCCH candidates in USS set 2 for reservation.

After selecting from the USS set including WUP PDCCH candidates, the base station selects PDCCH candidates from other USS sets in ascending order of search space set ID. The USS sets that do not contain WUP PDCCH candidates are USS set 1 and USS set 3. Therefore, the base station selects 3 PDCCH candidates in CSS set 1 for reservation as long as the number of monitored PDCCH candidates corresponding to the reserved PDCCH candidates and the number of CCEs corresponding to the reserved PDCCH candidates each do not exceed a threshold value.

After selecting from USS set 1, the base station determines whether to select a PDCCH candidate from USS set 3 for reservation. For example, if the base station selects 2 PDCCH candidates in CSS set 3, at least one of the number of monitored PDCCH candidates corresponding to reserved PDCCH candidates and the number of CCEs corresponding to reserved PDCCH candidates exceeds a threshold value, then the base station does not select from USS set 3.

Example embodiment 5

In some embodiments, if the USS set includes at least one WUP PDCCH candidate, then it is preferable to reserve at least one WUP PDCCH candidate.

In these embodiments, the base station sequentially selects PDCCH candidates according to the appropriate set of search spaces. In some embodiments, the base station preferably selects a WUP PDCCH candidate in the set of search spaces for reservation.

The base station first selects 2 PDCCH candidates in the CSS set as reserved PDCCH candidates according to the order "first CSS then USS". The base station then selects PDCCH candidates from the USS set to reserve. In the USS set, the base station preferably handles the USS set containing the WUP PDCCH candidates, and preferably selects the WUP PDCCH candidates from the USS set.

Based on the above description, the base station determines whether the WUP PDCCH candidates in USS set 2 should be reserved. For example, if the number of monitored PDCCH candidates corresponding to all reserved PDCCH candidates and the number of CCEs corresponding to the reserved PDCCH candidates each do not exceed an appropriate threshold, the base station selects 2 WUP PDCCH candidates in USS set 2 as reserved PDCCH candidates.

After the base station reserves the WUP PDCCH candidates in USS set 2, the base station continues to determine whether to reserve other PDCCH candidates in USS set 2. If at least one of the number of monitored PDCCH candidates corresponding to all reserved PDCCH candidates and the number of CCEs corresponding to the reserved PDCCH candidates exceeds a threshold value by selecting other PDCCH candidates as reserved PDCCH candidates in USS set 2, then no non-WUP PDCCH candidates are selected for reservation in USS set 2.

Example 6

In some embodiments, within a slot that includes WUP PDCCH candidates, selecting a PDCCH candidate for reservation may be based on one or more of the following rules:

only selecting WUP PDCCH candidates;

selecting only (a) WUP PDCCH candidates and (b) PDCCH candidates in the CCS set;

selecting only (a) PDCCH candidates in a search space including WUP PDCCH candidates and (b) PDCCH candidates in a CCS set; or (b)

Only (a) WUP PDCCH candidates or (b) PDCCH candidates informing of Slot Format Indication (SFI) are selected.

In these embodiments, within a slot that includes WUP PDCCH candidates, the base station selects a PDCCH candidate for reservation based on one or more of the following rules:

only selecting WUP PDCCH candidates;

Only (a) WUP PDCCH candidates and (b) PDCCH candidates informing of Slot Format Indication (SFI) are selected.

For example, the base station selects only (a) WUP PDCCH candidates and (b) PDCCH candidates in the CCS set; referring to fig. 8, the base station selects 2 PDCCH candidates in the CSS set and 2 WUP PDCCH candidates in USS set 2 as reserved PDCCH candidates.

Example 7

In some embodiments, the base station signals the second set of resources within the first set of resources. For example, the first set of resources may be partitioned into multiple sets of resources according to a predetermined rule, and the base station may indicate one or more resource indexes. In this way, the base station indicates the second set of resources by signaling in at least one of the following ways.

Indicating the second set of resources by higher layer signaling (e.g., RRC signaling);

indicating, by the MAC CE, a second set of resources;

indicating a second set of resources through physical downlink control signaling; or (b)

The second set of resources is indicated by the sequence.

In these embodiments, the base station indicates one or more resources of the first set of resources as a second set of resources, and the base station selects one or more resources from the second set of resources as a physical downlink control channel for the base station to transmit Downlink Control Information (DCI) to the at least one terminal.

By way of example, the first set of resources includes time-frequency resources occupied by CORESET, where CORESET corresponds to one or more sets of search spaces in or at the time of a time slot. The base station indicates one or more resources in the first set of resources to compose a second set of resources. The base station selects one or more PDCCH candidates from the second group as PDCCH channels for transmitting downlink control information to at least one terminal.

For example, the base station configures a search space set 1 and a search space set 2 for the terminal. The set of search spaces may include PDCCH resources of different aggregation levels. In this example, the separate set of search spaces includes only PDCCH candidates of aggregation level L.

As shown in fig. 9, for search space set1, the base station determines that the resources of CORESET1 in slot n of the corresponding search space set1 are the time-frequency resources of CORESET1 at time 0 and time 1 based on the following configuration:

search space set1 corresponds to CORESET1, and the time domain duration of CORESET1 is 2 symbols;

search space set1 has 2 PDCCH monitoring instants in one slot, and the starting symbol indexes of the instants are symbol 0 and symbol 5, respectively.

As shown in fig. 9, for search space set 2, the base station determines that the resource of CORESET1 in slot n of the corresponding search space set 2 is the time-frequency resource of CORESET1 at time 0 based on the following configuration:

search space set 2 corresponds to CORESET1, and the time domain duration of CORESET1 is 2 symbols;

search space set 2 has 1 PDCCH monitoring time instant in one slot, and the starting symbol index of the time instant is symbol 0.

In these embodiments, the base station indicates one or more resources of the first set of resources as the second set of resources, and the second set of resources includes one or more PDCCH candidates. More specifically, the first set of resources corresponds to one or more sets of search spaces of time-frequency resources occupied by CORESET in one time slot.

As shown in fig. 10, for search space set 2, the first set of resources is the time-frequency resources of CORESET1 at time 0 in time slot n of the corresponding search space set 2. The base station indicates resources in the first group as the second group of resources. This may be accomplished by the base station indicating at least one of (a) one or more aggregation levels and (b) one or more resource indices corresponding to the aggregation level L. For the combining level L, at one time instant, the resource index i indicated by the base station corresponds to CCE indexes i×l to (i+1) ×l-1. As shown in fig. 10, for the combining level L, the second group of resources indicated by the base station for search space set 2 corresponds to PDCCH candidates whose resource indices are 0 and 7 at time 0 in slot n.

For search space set1, the first set of resources are the time-frequency resources of CORESET1 at time 0 and time 1 in time slot n of the corresponding search space set 1. By the same approach as discussed for search space set 2, the second set of resources includes PDCCH candidates whose resource indices are 2, 6 at time 0 and time 1 in slot n, as shown in fig. 10. Of course, the location of the PDCCH candidate in search space set1 may be determined by other methods.

The base station then selects one or more PDCCH candidates from the second set of resources as a PDCCH channel for the base station to transmit Downlink Control Information (DCI) to the at least one terminal.

At least one terminal selects one or more PDCCH candidate resources for reservation, as commanded by the base station by signaling, and monitors the PDCCH for communication with the base station based on the reserved PDCCH candidates.

Example 8

In some embodiments, the base station determines one or more resources from the first set of resources as the second set of resources according to appropriate rules. In these embodiments, the appropriate rules include a first rule and a second rule. The base station determines one or more resources in a first set of resources according to a first rule. The resources determined according to the first rule are referred to as first partial resources. The base station determines one or more resources in the first set of resources according to a second rule. The resources determined according to the second rule are referred to as second partial resources. The second set of resources determined by the base station includes a first portion of resources and a second portion of resources.

As shown in fig. 11, the set of search spaces configured by the base station for the terminal includes a set of search spaces 1. Search space set1 may include PDCCH candidates of different aggregation levels. In this example, the separate set of search spaces includes only PDCCH candidates of aggregation level L.

As shown in fig. 11, the time-frequency resource of CORESET1 in time slot n is the time-frequency resource of CORESET1 at time 0. For example, the time-frequency resources of CORESET1 at time 0 in time slot n constitute a first set of resources. According to a first rule, the base station selects resources numbered 3 and 7 in fig. 11 as the first partial resources. For example, the first rule may be based on an LTE ePDCCH hash function. According to the second rule, the base station selects resources numbered 0 and 5 in fig. 11 as the second partial resources. For example, the second rule may be two resources in the first set of resources that are randomly selected except for the resources numbered 3 and 7. The base station determines the first and second part of resources, i.e. the resources numbered 0, 3, 5 and 7 in fig. 11, to form a second set of resources.

According to the same rules indicated above, at least one terminal may select one or more PDCCH candidate resource reservations based on the calculation and monitor the PDCCH for communication with the base station based on the reserved PDCCH candidates.

Fig. 12 illustrates an example of a wireless communication system to which one or more embodiments in accordance with the present disclosure may be applied. The wireless communication system 1200 may include one or more Base Stations (BSs) 1205a, 1205b, one or more wireless devices (e.g., terminals or UEs) 1210a, 1210b, 1210c, 1210d, and an access network 1225. Base stations 1205a, 1205b may provide access services to wireless devices 1210a, 1210b, 1210c, and 1210d in one or more wireless sectors. In some applications, the base stations 1205a, 1205b include directional antennas that generate two or more directional beams to provide wireless coverage for different sectors.

The access network 1225 may communicate with one or more base stations 1205a, 1205b. In some applications, the access network 1225 includes one or more base stations 1205a, 1205b. In some applications, access network 1225 communicates with a core network (not shown in fig. 12) that provides connectivity to other wireless and wireline communication systems. The core network may include one or more service subscription databases to store information related to subscribed wireless devices 1210a, 1210b, 1210c, and 1201 d. The first base station 1205a may provide wireless service based on a first radio access technology, and the second base station 1205b may provide wireless service based on a second radio access technology. Base stations 1205a and 1205b may be co-located or installed separately on site depending on the deployment scenario. Access network 1225 may support a number of different radio access technologies.

In some applications, a wireless communication system may include multiple wireless networks using different wireless technologies. Dual-mode or multi-mode wireless devices include two or more wireless technologies that may be used to connect different wireless networks.

Fig. 13 is a block diagram representing a portion of a radio station. A radio station 1305, such as a base station or terminal (or UE), may include processor circuitry 1310, such as a microprocessor, that applies one or more of the wireless techniques presented herein. The radio 1305 may include transceiver circuitry 1315 to transmit and/or receive wireless signals over one or more communication interfaces, such as an antenna 1320. The radio 1305 may include other communication interfaces for transmitting and receiving data. The radio 1305 may include one or more memories (not explicitly shown) configured to store information such as data and/or instructions. In some applications, the processor circuit 1310 may include at least a portion of the transceiver circuit 1315. In some embodiments, at least some of the techniques, modules, or functions of this disclosure are implemented using a radio station 1305.

Some embodiments described herein are described in the general context of methods and processes that may be implemented in one embodiment by a computer program product, executed by a computer-readable medium, including computer-executable instructions, such as program code, executed by a computer in a network environment. The computer readable medium may include a removable or fixed storage device including, but not limited to, read Only Memory (ROM), random Access Memory (RAM), compact Discs (CD), digital Versatile Discs (DVD), and the like. Thus, the computer readable medium may include a non-transitory storage medium. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Computer or processor executable instructions, associated data structures, and program modules represent examples of the program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or flows.

Some disclosed embodiments may use hardware circuitry, software, or a combination thereof as device and module applications. For example, a hardware circuit application may include discrete analog and/or digital components, such as integrated as part of a printed circuit board. Alternatively, or in addition, the disclosed components or modules may be applied as Application Specific Integrated Circuits (ASICs) and/or programmable gate array (FPGAs) devices. Some applications may additionally or alternatively include a Digital Signal Processor (DSP), which is a special purpose microprocessor with an architecture optimized for the operational needs of digital signal processing associated with the functions disclosed in this application. Similarly, individual components or sub-components in each module may be implemented in software, hardware, or firmware. Connectivity between modules and/or components within modules may be provided using any of the connection methods and mediums known in the art, including, but not limited to, communication over the internet, wired or wireless networks using appropriate protocols.

Since this patent application contains many specifics, these should not be construed as limitations on the scope of any invention or of what may be claimed, but rather as descriptions of features specific to particular embodiments of particular inventions. Suitable features described in the text of different embodiments in this patent application can also be applied 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 discrete embodiments or in any suitable subcombination. Furthermore, although features may be described above as applied in suitable combinations and initially claimed as such, one or more features from a claimed combination may in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.

Similarly, operations are depicted in the drawings in a particular order, which 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. Furthermore, the separation of various system components in the embodiments described in the present application should not be understood as requiring such separation in all embodiments.

Only some applications and examples are described, while other applications, enhancements and variations may be made based on the description and examples of the present patent application.

Claims

1. A method of wireless communication, comprising:

selecting a second set of resources from the first set of resources based on at least one of symbol direction, division of time slots, use of resources, or signaling; and is also provided with

Performing physical channel-based wireless communication using at least one or more of the second set of resources;

wherein selecting the second set of resources comprises selecting one or more PDCCH candidates from a plurality of sets of user specific search spaces USS based on at least one of:

preferably selecting one or more PDCCH candidates from a first subset of said plurality of USS sets, wherein each of said plurality of USS sets comprises at least one WUP PDCCH candidate;

One or more PDCCH candidates are selected from a second subset of the plurality of USS sets according to a search space set ID, wherein the second subset is any USS set excluding the first subset.

2. The method of claim 1, wherein the first set of resources comprises a plurality of physical downlink control channel, PDCCH, candidates corresponding to one or more sets of search spaces.

3. The method of claim 2, wherein the second set of resources comprises a subset of the plurality of PDCCH candidates.

4. The method of claim 1, wherein performing the wireless communication comprises:

selecting one or more PDCCH candidates from the second set of resources; and is also provided with

One or more downlink control information, DCI, is transmitted using the selected one or more PDDCH candidates.

5. The method of claim 1, wherein selecting the second set of resources is based at least in part on at least one of:

a total number of blind detections of PDCCH candidates corresponding to the second set of resources, a total number of control channel element CCEs associated with the PDCCH candidates of the second set of resources.

6. The method of claim 5 wherein neither the blind detection total number of PDCCH candidates corresponding to the second set of resources nor the total number of CCEs associated with the PDCCH candidates of the second set of resources exceeds a respective threshold value.

7. The method of claim 5, wherein one or more target PDCCH candidates included in the second set of resources are excluded from the PDCCH candidates for purposes of determining at least one of the total number of blind detections and the total number of CCEs, wherein the one or more target PDCCH candidates are used to inform at least one of: terminal wake-up information, downlink control information associated with terminal wake-up.

8. The method of claim 1, wherein the time slot in which the at least one PDCCH candidate for terminal wakeup is located comprises a plurality of divided time slots.

9. The method of claim 8, wherein selecting the second set of resources comprises:

one or more of the PDCCH candidates are selected in a first partitioned slot of the slot based at least in part on a first rule.

10. The method of claim 9, wherein the first rule comprises at least one of:

only selecting one or more wake-up physical downlink control channel (WUP PDCCH) candidates to be added to the second group of resources;

only one or more WUP PDCCH candidates and one or more PDCCH candidates for informing of a slot format are selected to be added to the second set of resources.

11. The method of claim 8, wherein selecting the second set of resources comprises:

one or more PDCCH candidates are selected in a second partitioned slot of the slot based at least in part on a second rule.

12. The method of claim 11, wherein the second rule comprises: one or more PDCCH candidates are selected for inclusion in the second group according to an order of at least one of a search space set type or a search space set index.

13. The method of claim 1, wherein selecting the second set of resources based on the symbol direction comprises: one or more PDCCH candidates overlapping one or more symbols indicated as uplink symbols are excluded from the second set of resources.

14. The method of claim 1, wherein selecting the second set of resources based on the symbol direction comprises: one or more PDCCH candidates overlapping one or more symbols indicated as flexible symbols are excluded from the second set of resources.

15. The method of claim 1, wherein selecting the second set of resources based on the symbol direction comprises: in the case where the set of search spaces includes at least one PDCCH candidate overlapping one or more symbols indicated as uplink symbols, all PDCCH candidates in the set of search spaces are excluded from the second set of resources.

16. The method of claim 1, wherein selecting the second set of resources based on the symbol direction comprises: in the case that the set of search spaces includes at least one PDCCH candidate overlapping one or more symbols indicated as flexible symbols, all PDCCH candidates in the set of search spaces are excluded from the second set of resources.

17. The method of claim 1, wherein selecting the second set of resources comprises, if a USS set includes one or more WUP PDCCH candidates, preferably selecting at least one WUP PDCCH candidate within the USS set.

18. The method of claim 1, wherein selecting the second set of resources comprises performing at least one of the following in a slot that includes at least one WUP PDCCH candidate:

selecting only one or more WUP PDCCH candidates;

selecting only one or more WUP PDCCH candidates and one or more PDCCH candidates included in one or more common search space CSS sets;

selecting only one or more PDCCH candidates from one or more search space sets, each of which includes at least one WUP PDCCH candidate, and one or more PDCCH candidates included in one or more CSS sets;

Only one or more WUP PDCCH candidates and one or more PDCCH candidates for informing a Slot Format Indication (SFI) are selected.

19. The method of claim 1, wherein the first set of resources is divided into multiple sets of resources according to one or more predetermined rules, and wherein a base station forms the second set of resources by signaling one or more resource indices.

20. The method of claim 1, wherein a base station indicates the second set of resources based at least in part on the first set of resources by signaling, wherein the signaling comprises at least one of: higher layer signaling, MAC CE, physical downlink control signaling, at least one sequence.

21. The method of claim 18, wherein the second set of resources is indicated at least in part by at least one of: index of the sequence, cyclic shift of the sequence, time-frequency resource position occupied by the sequence.

22. The method of claim 1, wherein performing the wireless communication comprises:

one or more PDCCHs are monitored based at least in part on the subset of the second set of resources.

23. The method of claim 22, wherein monitoring the one or more PDCCHs comprises at least one of: blind detection, CCE estimation.

24. An apparatus for wireless communication, characterized in that the apparatus is adapted to perform the method of any of claims 1 to 23.

25. A non-volatile computer readable storage medium, characterized in that the storage medium has stored therein code which, when executed by a processor, implements the method of any of claims 1 to 23.