CN108616993B

CN108616993B - Scheduling method and device of physical channel resources

Info

Publication number: CN108616993B
Application number: CN201810436465.XA
Authority: CN
Inventors: 丁宝国; 刘建青
Original assignee: Comba Telecom Systems China Ltd
Current assignee: Comba Network Systems Co Ltd
Priority date: 2018-05-09
Filing date: 2018-05-09
Publication date: 2021-03-19
Anticipated expiration: 2038-05-09
Also published as: WO2019214264A1; CN108616993A

Abstract

The application discloses a scheduling method and device of physical channel resources, which are applied to a narrowband Internet of things, and the method comprises the following steps: a base station acquires the coverage levels of M user equipment, wherein M is a positive integer; the base station determines the initial resource scheduling offset time and the scheduling range of each user equipment according to the coverage grades of the M user equipments; the base station determines a scheduling interval corresponding to each user equipment according to the initial resource scheduling offset time and the scheduling range of each user equipment; and the base station schedules a narrowband physical downlink control channel NPDCCH for the user equipment in a scheduling interval corresponding to each user equipment.

Description

Scheduling method and device of physical channel resources

Technical Field

The present application relates to the field of wireless communications, and in particular, to a method and an apparatus for scheduling physical channel resources.

Background

Generally, internet of things devices can be classified into three categories: the system does not need mobility, has large data volume (uplink) and needs a wider frequency band, such as a city monitoring camera. Secondly, the mobility is strong, frequent switching needs to be executed, and the data volume is small, such as motorcade tracking management. And thirdly, mobility is not needed, the data volume is small, and the data volume is not sensitive to time delay, such as intelligent meter reading. The NB-IoT is generated for the third kind of internet of things. NB-IoT sources arise from the following big demands of the internet of things at the present stage: coverage enhancement (20 dB enhancement); large-scale connection is supported, and 100K terminals/200 KHz cells are arranged; ultra-low power consumption, 10 years battery life; the cost is ultra-low, and the signaling overhead, especially the air interface signaling overhead, is minimized; ensuring the security of the whole system, including the security of a core network; support for IP and non-IP data transport; short message support (optional deployment), and the like.

The cellular-based narrowband Internet of Things (NB-IoT) is an important branch of the Internet of everything. The NB-IoT is mainly oriented to low-cost, low-power consumption, low-speed and wide-coverage Internet of things services, such as sensors, meter reading, logistics monitoring, tracking and the like. The NB-IoT is constructed in a cellular network, only consumes about 180KHz of bandwidth, and the uplink and downlink peak rates do not exceed 250 kbit/s. The method can be directly deployed in a GSM network, a UMTS network or an LTE network so as to reduce the deployment cost and realize smooth upgrading.

The above requirements cannot be completely met for the existing LTE network. Even in LTE-a, mainly the functions of carrier aggregation, dual connectivity, and D2D are concerned, and the internet of things is not considered. For example, in coverage, taking a water meter as an example, the wireless environment of the position is poor, compared with a smart phone, the height difference causes a signal difference of 4dB, and meanwhile, a cover is covered, so that about 10dB of additional loss is added, and 20dB of enhancement is needed. On a large scale, there are too many internet of things devices, which may result in network overload if the existing LTE network is used to connect these mass devices. In addition, NB-IoT has its own features, such as no QoS anymore, since today's NB-IoT does not transmit delay sensitive data packets, e.g. real time IMS like devices, which do not appear in NB-IoT networks.

NB-IoT can achieve 20dB coverage enhancement over traditional by repeating its transmission many times to improve its coverage (Maximum Coupling Loss (MCL), path Loss from base station antenna port to terminal antenna port).

The downlink physical channels adopt a time division multiplexing mode, and because the resources are limited and the repeated transmission is supported, the uplink and the downlink of the NB-IoT adopt asynchronous adaptive HARQ, that is, retransmission is determined according to newly received dci (downlink Control information). In addition, to reduce the complexity of the terminal, NB-IoT supports only one HARQ process and allows for longer UE decoding time for NPDCCH and NPDSCH. The DCI may be used to schedule downlink data or uplink data. The scheduling command is transmitted through DCI carried on NPDCH, which transmits DCI using Aggregation Levels (AL) 1 or AL 2. For AL1, two DCIs are multiplexed in one subframe, or one subframe carries only one DCI (i.e., AL2) to reduce coding rate and improve coverage. Coverage is enhanced by retransmissions, which occupy one subframe per retransmission.

Therefore, the duration and the start time of transmission of the Narrowband Physical Downlink Control Channel (NPDCCH), the Narrowband Physical Downlink Shared Channel (NPDSCH) and the Narrowband Physical Uplink Shared Channel (NPUSCH) of users with different coverage in the NB-IoT may be very different. In the prior art, for the NPDCCH, NPDSCH or NPUSCH allocation scheme, the situation of network resource waste is easily caused in the time domain scheduling process of different users, so that the utilization rate of NPDCCH resources is low, and even data of users with large coverage and long duration are difficult to send out, thereby causing network congestion and low scheduling efficiency.

Disclosure of Invention

The embodiment of the application provides a method and a device for scheduling physical downlink control channel resources, which are used for solving the problem of low utilization rate of PDCCH resources in the prior art.

The embodiment of the application provides a scheduling method of physical channel resources, which is applied to a narrowband Internet of things and comprises the following steps:

a base station acquires the coverage levels of M user equipment, wherein M is a positive integer;

the base station determines the initial resource scheduling offset time and the scheduling range of each user equipment according to the coverage grades of the M user equipments;

the base station determines a scheduling interval corresponding to each user equipment according to the initial resource scheduling offset time and the scheduling range of each user equipment;

and the base station schedules a narrowband physical downlink control channel NPDCCH for the user equipment in a scheduling interval corresponding to each user equipment.

The coverage grades of M pieces of user equipment are obtained through a base station, wherein M is an integer larger than 0; the base station takes the user equipment belonging to the same coverage grade in the M user equipment as a group, and determines the initial resource scheduling offset time and the scheduling range corresponding to the coverage grade of each group of user equipment; and the base station schedules the NPDCCH for the user equipment in the scheduling interval corresponding to the starting resource scheduling offset time and the scheduling range corresponding to each group of user equipment. The method and the device can realize the allocation of the resources of the NPDCCH according to the user equipment with different coverage grades, so that the user equipment with low resource demand can obtain less PDCCH resources, the user equipment with high resource demand can obtain more PDCCH resources, the waste of the PDCCH resources is avoided, and the utilization rate of the PDCCH resources is improved. In addition, the scheduling interval includes a plurality of search spaces of the NPDCCH which is allocated corresponding to the coverage grade. The M user equipment can be completely scheduled in the corresponding scheduling interval in one scheduling period, and in the scheduling process, the scheduling can be completed only by searching the NPDCCH in the corresponding scheduling interval, so that the scheduling efficiency is greatly improved.

A possible implementation manner, where the base station determines, according to the coverage classes of the M user equipments, a starting resource scheduling offset time of each user equipment, includes:

and if the base station determines that the coverage grade corresponding to the first user is smaller than the coverage grade corresponding to the second user, setting the initial resource scheduling offset time of the coverage grade corresponding to the second user to be larger than or equal to the end time of the scheduling interval corresponding to the coverage grade corresponding to the first user.

By the method, the scheduling intervals with different coverage levels can be staggered in the time domain space, so that the problems of low scheduling efficiency and low resource utilization rate when the user equipment with different durations is scheduled are avoided, the phenomenon that the allocation of higher coverage users is unsuccessful due to retransmission fragments of users with low coverage levels can be avoided, and the user resource searching computation amount is reduced.

A possible implementation manner, where the base station determines a scheduling range of each user equipment according to the coverage levels of the M user equipments, includes:

the base station determines the number of search spaces corresponding to the coverage levels and the size of each search space according to the coverage levels corresponding to the M pieces of user equipment;

the base station determines the scheduling range of the coverage grade according to the number of the search spaces of the coverage grade and the size of each search space;

wherein a size of a search space of the coverage level is positively correlated with the coverage level; the search space allocates a minimum period of NPDCCH to the user equipment for the base station.

According to the method, the processing time for searching resources for the user equipment and the allocation success rate can be effectively balanced, the allocation efficiency is improved, and the allocation delay is reduced.

and the base station determines the scheduling range according to the searching capability of the base station and the number of the user equipment needing to be scheduled.

By the method, the scheduling range can be determined according to the capability of the base station and the requirements of users, the number of various scheduling ranges set by the base station for the scheduling range is reduced, the processing amount of the base station is reduced, in addition, the scheduling range is determined according to the number of user equipment, the resource utilization rate can be further improved, and the resource allocation efficiency is improved.

In one possible implementation, the method further includes:

and if the base station does not find the available NPDCCH in the scheduling interval, the base station adds the user equipment into the next scheduling period for scheduling.

And adding the user equipment into the next scheduling period, and increasing the priority of the user equipment so as to transmit the data of the user equipment as soon as possible, thereby improving the efficiency of resource scheduling of the user equipment.

The embodiment of the application provides a scheduling device of physical channel resource, is applied to the narrowband thing networking, includes:

the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring the coverage levels of M pieces of user equipment, and M is a positive integer;

a processing unit, configured to determine, according to the coverage levels of the M user equipments, a starting resource scheduling offset time and a scheduling range of each user equipment; determining a scheduling interval corresponding to each user equipment according to the initial resource scheduling offset time and the scheduling range of each user equipment; and scheduling the NPDCCH for the user equipment in a scheduling interval corresponding to each user equipment.

In one possible implementation, the processing unit is specifically configured to:

and if the coverage grade corresponding to the first user is determined to be smaller than the coverage grade corresponding to the second user, setting the initial resource scheduling offset time of the coverage grade corresponding to the second user to be larger than or equal to the end time of the scheduling interval corresponding to the coverage grade corresponding to the first user.

determining the number of search spaces corresponding to the coverage levels and the size of each search space according to the coverage levels corresponding to the M pieces of user equipment; determining the scheduling range of the coverage grade according to the number of the search spaces of the coverage grade and the size of each search space; wherein a size of a search space of the coverage level is positively correlated with the coverage level; the search space allocates a minimum period of NPDCCH to the user equipment for the base station.

and determining the scheduling range according to the searching capability of the base station and the number of the user equipment needing to be scheduled.

In one possible implementation, the processing unit is further configured to:

and if the available NPDCCH is not found in the scheduling interval, the base station adds the user equipment into the next scheduling period for scheduling.

Drawings

Fig. 1 is a flowchart illustrating a method for scheduling physical channel resources according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a scheduling method of physical channel resources according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a scheduling apparatus of physical channel resources according to an embodiment of the present application.

Detailed Description

As shown in fig. 1, an embodiment of the present application provides a scheduling method of physical channel resources, which is applied to a narrowband internet of things, and includes the following steps:

step 101: a base station acquires the coverage levels of M user equipment, wherein M is a positive integer;

step 102: the base station determines the initial resource scheduling offset time and the scheduling range of each user equipment according to the coverage grades of the M user equipments;

step 103: the base station determines a scheduling interval corresponding to each user equipment according to the initial resource scheduling offset time and the scheduling range of each user equipment;

step 104: and the base station schedules a narrowband physical downlink control channel NPDCCH for the user equipment in a scheduling interval corresponding to each user equipment.

By the method, the NPDCCH resources can be distributed according to the user equipment with different coverage grades, so that the user equipment with low resource demand can obtain less PDCCH resources, the user equipment with high resource demand can obtain more PDCCH resources, the waste of PDCCH resources is avoided, and the utilization rate of PDCCH resources is improved. Therefore, the users with enhanced coverage level, especially the users with high coverage level, are easy to be successfully scheduled, and the scheduling delay is reduced. In addition, the scheduling interval includes a plurality of search spaces of the NPDCCH which is allocated corresponding to the coverage grade. The M pieces of user equipment can be completely scheduled in the corresponding scheduling interval in one scheduling period, and in the scheduling process, scheduling can be completed only by searching the NPDCCH in the corresponding scheduling interval, so that the processing efficiency of scheduling and resource allocation is improved, the effects of efficient scheduling and scheduling delay reduction are achieved, and the scheduling efficiency is greatly improved.

Since NB-IoT needs to achieve longer standby time. Usually, the method can be implemented by means of a Power Saving Mode (PSM) and an Enhanced Discontinuous Reception (eDRX), for example, in the PSM Mode, the ue still registers in the network but the signaling is not reachable, so that the ue can stay in deep sleep for a longer time to achieve the purpose of Saving Power. The eDRX further extends the sleep cycle of the user equipment in the idle mode, reducing unnecessary activation of the receiving unit in the user equipment.

In a possible implementation manner, the ue may set a start period, and only when data transmission is needed, the ue starts to register, and at this time, the ue needs to perform NPDCCH scheduling.

In step 101, the base station may determine the M user equipments according to a preset rule when a scheduling period is reached.

The scheduling period may be 1ms, 2ms, and the like, and specifically, the scheduling period may be set according to the processing capability of the base station and the delay requirement of the user equipment, so as to ensure that the scheduling of the M user equipments is completed in the scheduling period.

In the NB-IoT system, uplink and downlink resource scheduling information (e.g., resource allocation result, coded modulation scheme, etc.) is carried by NPDCCH. While DCI (Downlink Control Information) in NPDCCH includes resource allocation and other Control Information on one or more user equipments. After acquiring the NPDCCH, each user equipment determines a resource location corresponding to the NPDSCH used for transmitting downlink data (including broadcast messages, paging, data of the UE, and the like) and determines a resource location corresponding to the NPUSCH used for transmitting uplink data by demodulating DCI in the NPDCCH. NPDCCH contains UL grant to indicate the resources used by the UE for uplink data transmission.

The preset rules include: and determining the M user equipment according to the priority of the user equipment, the scheduling delay of the user equipment, the service type of the user equipment and the like. For different uplink and downlink data volume requirements and periods, M user equipments in one scheduling period may be determined. For example, an autonomous exception reporting traffic type. For example, the smoke alarm detector and the intelligent electric meter are informed of power failure, the uplink data has extremely small data volume requirement (cross section magnitude), and the period can be in units of year and month. 2) The traffic type is reported autonomously and periodically. Such as intelligent utility (gas/water/electricity) measurement reports, intelligent agriculture, intelligent environments, etc., with small uplink data volume requirements (on the order of hundreds of bytes) with periods that can be in days and hours. 3) The network instructs the type of service. If the device is turned on/off, the device triggers to send an uplink report and requests meter reading, the downlink has extremely small data volume requirement (cross section magnitude), and the cycle can be in units of days and hours. 4) A software update service type. Such as software patching/updating, the uplink and downlink have large data volume requirements (on the order of kilobytes), and the period can be in the unit of days and hours.

It can be seen that, in the time domain scheduling process, different types of user equipments have a large difference in data volume requirements, and therefore, in the user equipments to be scheduled in the current scheduling period, M user equipments are selected for scheduling according to the rules of the processing capability of the base station, the service type of the user equipment, and the like, so that the scheduling capability of the base station can be balanced, the scheduling congestion is reduced, and the scheduling efficiency is improved.

In a specific implementation process, resource allocation can be performed according to the selected M user equipments, the user equipments are sorted by user equipment priority or polling, and the first M user equipments are selected for priority resource allocation, so as to improve the resource utilization rate.

NB-IoT can achieve 20dB coverage enhancement over traditional by repeating its transmission many times to improve its coverage (Maximum Coupling Loss (MCL), path Loss from base station antenna port to terminal antenna port). Taking a water meter as an example, the wireless environment of the position where the water meter is located is poor, compared with a smart phone, the height difference causes the signal difference to be 4dB, and meanwhile, a cover is covered, so that about 10dB loss is additionally increased, and therefore coverage enhancement is needed.

For example, the Coverage Level (CE Level) may be divided into three levels, which correspond to the signal attenuation against 144dB, 154dB and 164dB, respectively. The base station and the user equipment of the NB-IoT select the corresponding information retransmission times according to the coverage level of the base station and the user equipment of the NB-IoT. The coverage level of the ue may be determined when the ue accesses the ue, and the specific determination manner is not described herein again.

The NB-IoT manages wireless resources required for data transmission between an Evolved Node Base station (eNB) and a user equipment (ue) in a centralized control manner. As in the LTE system, the UE transmits or receives data as instructed by the eNB, Downlink Assignment (Downlink Assignment) and Uplink Grant (Uplink Grant) for Downlink transmission, respectively; namely, a Downlink Control Indicator (DCI), the uplink part uses the DCI format, the Downlink part uses the DCI N1 format, and the Paging part uses the DCI N2 format.

The UE periodically monitors/monitors (Monitor) the DCI transmission region, i.e. the Narrowband Physical Downlink Control Channel (NPDCCH), also called Search Space (Search Space), during the linking process with the base station. After receiving the DCI, the UE indicates the corresponding data transmission region, i.e., the narrow-band physical downlink shared channel (NPDSCH), to receive data according to its content. NPDCCH does not occur every subframe, but occurs periodically. Each search space has a maximum repetition number Rmax corresponding to Radio Resource Control (RRC) configuration, and the appearance cycle of the search space is the product of the corresponding Rmax and a parameter configured by an RRC layer. The ue of NB-IoT can use the start time of the search space where the DCI is located to calculate the end time of the DCI and the start time of the scheduled data for transmitting or receiving data.

In addition, in the time domain scheduling process, the NB-IoT is in an FDD half-duplex type-B mode. I.e. the uplink and downlink are separated in frequency, the user equipment does not handle reception and transmission at the same time, and the user equipment only needs one switch to change the transmission and reception mode. Therefore, different uplink transmission durations and different downlink transmission durations affect the scheduling of the NPDCCH by the base station. For low coverage level users, data transmission may be performed through DL Gap or UL Gap mechanisms.

In step 102, the initial resource scheduling offset time of the coverage level corresponding to the ue is a time after a preset offset time for a scheduling time in the scheduling period of the base station; for example, if it is determined that the time point of starting scheduling of the base station is T0, the offset time preset by the first coverage class is T1, and the initial resource scheduling offset time of the first coverage class is T0+ T1.

In order to improve the resource utilization rate of NPDCCH and reduce resource fragments, the initial resource scheduling offset time may also be set according to the coverage level and the duration of the signal to be transmitted of the user equipment corresponding to the coverage level.

For example, assume that a first user device and a second user device correspond to a first coverage level and a third user device corresponds to a second coverage level; the time length of a signal to be sent of the first user equipment is 1ms, and the time length of a signal to be sent of the second user equipment is 2 ms;

if it is determined that the starting resource scheduling offset time corresponding to the first coverage class is 10ms and the scheduling range of the first coverage class is 12ms, the starting resource scheduling offset time of the second coverage class may be set to be 24ms, which is 10ms +12ms +2 ms.

A possible implementation manner, where the base station determines a starting resource scheduling offset time of each ue according to the coverage classes of the M ues, may include:

For example, if it is determined that the preset offset time of the first coverage class is T1 and the scheduling range of the first coverage class is T1, the start time of the scheduling interval of the first coverage class is the start resource scheduling offset time T0+ T1 of the first coverage class, and the end time of the scheduling interval of the first coverage class is T0+ T1+ T1. The preset bias time for the second coverage level may be T2, and the starting resource scheduling bias time for the second coverage level may be T0+ T1+ T1+ T2. If the scheduling range of the second coverage class is T2, the end time of the scheduling interval of the second coverage class is T0+ T1+ T1+ T2+ T2.

By the method, the scheduling intervals with different coverage levels can be staggered in the time domain space, so that the problems of low scheduling efficiency and low resource utilization rate when the user equipment with different durations is scheduled are avoided, the phenomenon that the allocation of higher coverage users is unsuccessful due to retransmission fragments of users with low coverage levels can be avoided, and the user resource searching computation amount is reduced. For example, for a user with a small coverage level, the duration of sending NPDSCH is small, and the NPDSCH cannot be allocated to a user equipment with a large coverage level among NPDSCH occupied by different user equipments with a small coverage level, so that data of the user equipment with a large coverage level and a long duration can only be attempted to be sent at a later position, and then blocking occurs, which affects scheduling efficiency; in addition, resource fragments are easy to occur, and the resource utilization rate is low.

In step 102, to ensure that the M ues can be scheduled completely in the scheduling period and the resources can be reasonably utilized. A possible implementation manner, where the base station determines a scheduling range of each user equipment according to the coverage levels of the M user equipments, may include:

wherein the search space of the coverage level is positively correlated with the coverage level; the search space is the minimum period of the NPDCCH allocated by the base station to the user equipment.

In a specific implementation process, the scheduling range is determined according to the size of the search space of the NPDCCH corresponding to the coverage level and the number of the search spaces, that is, the number of searches. For example, if the coverage class corresponding to the ue sets the number of NPDCCH searches to 10, 10 NPDCCH search spaces corresponding to the coverage class are searched from a time point corresponding to a scheduling time offset from the initial resource scheduling offset time corresponding to the coverage class as the scheduling range of the coverage class.

For example, as shown in fig. 2, for a specific embodiment of the present application, the coverage levels include a first coverage level, a second coverage level, and a third coverage level, the starting resource scheduling offset time of the first coverage level is t1, the starting resource scheduling offset time of the second coverage level is t2, the starting resource scheduling offset time of the third coverage level is t3, the scheduling range of the first coverage level is n1 × pp1, the scheduling range of the second coverage level 202 is n2 × pp2, and the scheduling range of the third coverage level is n3 × pp 3. Wherein the n1, n2, n3 is the number of search times of the search space in the scheduling range corresponding to the coverage level; the pp1, pp2, pp3 is the duration of the search space in the scheduling range corresponding to the coverage level, and can be set to pp3> pp2> pp 1; for example, the number n1 of search spaces of the first coverage level may be 3, and the minimum period of each search space, i.e., NPDCCH, may be 1 s. The relationship between the starting resource scheduling offset times for different coverage classes can be expressed as: t2 is more than or equal to t1+ n1 Xpp 1; t3 is more than or equal to t2+ n2 Xpp 2; the starting resource scheduling offset time t1 for the first coverage level in the next scheduling period may be set to t1 ≧ t3+ n3 XP 3.

A possible implementation manner, where the base station determines a scheduling range of each user equipment according to the coverage levels of the M user equipments, may further include:

In a specific implementation process, the base station determines a searchable maximum range according to the processing capability of the CPU of the base station and the storage space, for example, the scheduling range may be 1 hour; the scheduling range may also be determined according to the number of the user equipments to be scheduled, for example, if the number of the user equipments is determined to be small, the scheduling range may be set to be at least 1 duration of the search space.

In addition, the scheduling interval corresponding to the coverage level may also be set according to other manners, which is not limited herein.

In step 103, the base station uses the initial resource scheduling offset time of the coverage class as the initial time of the scheduling interval corresponding to the coverage class, and uses the time obtained by adding the initial time to the scheduling range of the coverage class as the end time of the scheduling interval of the coverage class.

For example, the start time of the scheduling interval of the first coverage level is the start resource scheduling offset time T0+ T1 of the first coverage level, and the end time of the scheduling interval of the first coverage level is T0+ T1+ T1.

In step 104, the embodiment of the present application further includes: and allocating NPDSCH and NPUSCH according to the allocation result of the NPDCCH.

The subframe structure of NPDSCH is the same as NPDCCH. NPDSCH is used to transmit downlink data and system information, and the bandwidth occupied by NPDSCH is one whole PRB size. A Transport Block (TB) may need to use more than one subframe for transmission according to the Modulation and Coding Scheme (MCS) used, and therefore, the Downlink Assignment received in NPDCCH includes a subframe number corresponding to the TB and an indication of the number of retransmissions.

NPUSCH is used to transmit uplink data as well as uplink control information. NPUSCH transmission may use single or multiple frequency transmission. The minimum unit mapped to a transport block is a Resource Unit (RU), which is determined by NPUSCH format and subcarrier space. The NB-IoT is a basic unit of resource allocation according to the number of subcarriers and slots. Since one TB may need to use multiple resource units for transmission, the Uplink Grant received in NPDCCH may also include the number of resource units corresponding to one TB and an indication of the number of retransmissions, in addition to an Index (Index) indicating a subcarrier of the resource unit used for Uplink data transmission.

Therefore, after the assignable NPDCCH is determined, when NPDSCH or NPUSCH needs to be assigned, the assignable NPDCCH can be determined according to the timing relationship between NPDCCH and NPDSCH or NPUSCH, that is, according to the delay (delay) and Resource Element (RE) of NPDSCH or NPUSCH.

For example, the base station determines to calculate an initial scheduling time according to an initial resource scheduling offset time of a coverage class corresponding to the user equipment, and searches for N available NPDCCHs according to a scheduling range of the coverage class; and traversing the NPDSCH or NPUSCH resources corresponding to the N NPDCCH resources according to the time sequence relation between the NPDCCH and the NPDSCH or NPUSCH. And if the NPDSCH or NPUSCH resource corresponding to one of the NPDCCH resources is determined to be not occupied, the NPDCCH resource and the NPDSCH active NPUSCH resource are distributed to the user equipment. In the specific implementation process, for the users with low coverage level, data transmission can be performed through a DL Gap or UL Gap mechanism.

According to the method, retransmission fragments of the users with the low coverage level can be avoided, the problem that the user equipment with the higher coverage level is unsuccessfully allocated is solved, the search calculation amount when the base station allocates resources for the user equipment is reduced, and the scheduling efficiency is improved.

After the NPDCCH is successfully allocated by the ue, resource allocation of the next ue is started, and the allocation manner may refer to the method described above, which is not described herein again.

In step 104, the method further comprises: and if the base station does not find the available NPDCCH in the scheduling interval corresponding to the initial resource scheduling offset time and the scheduling range, the base station adds the user equipment into the next scheduling period for scheduling.

With reference to the foregoing example, when the user equipment can successfully allocate NPDCCH resources in 10 search spaces of corresponding coverage levels, it is determined that NPDCCH resources of the user equipment are successfully allocated, and if not, it is determined that NPDCCH resources of the user equipment are unsuccessfully allocated.

Or, the user equipment searches N available NPDCCH resources in a scheduling implementation interval, but if none of NPDSCH or NPUSCH resources corresponding to the N available NPDCCH resources is available, it is determined that no available resource is allocated to the user equipment, it is determined that the user equipment fails to be scheduled in the scheduling period, the user equipment is added into a next scheduling period, and the priority of the user equipment can be increased, so that data of the user equipment is transmitted as soon as possible, and the efficiency of resource scheduling of the user equipment is improved.

As shown in fig. 3, an embodiment of the present application provides a scheduling apparatus for physical channel resources, which is applied to a narrowband internet of things, and includes:

an obtaining unit 301, configured to obtain coverage levels of M user equipments, where M is a positive integer;

a processing unit 302, configured to determine, according to the coverage levels of the M user equipments, a starting resource scheduling offset time and a scheduling range of each user equipment; determining a scheduling interval corresponding to each user equipment according to the initial resource scheduling offset time and the scheduling range of each user equipment; and scheduling the NPDCCH for the user equipment in a scheduling interval corresponding to each user equipment.

In a possible implementation manner, the processing unit 302 is specifically configured to:

In one possible implementation, the processing unit 302 is further configured to:

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, apparatus (device), or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A scheduling method of physical channel resources is applied to a narrowband Internet of things, and comprises the following steps:

the base station determines a scheduling interval corresponding to each user equipment according to the initial resource scheduling offset time and the scheduling range of each user equipment; the scheduling intervals of different coverage levels are not overlapped on a time domain;

2. The method of claim 1, wherein the base station determines the starting resource scheduling offset time of each ue according to the coverage classes of the M ues, comprising:

3. The method of claim 1 or 2, wherein the base station determines the scheduling range of each user equipment according to the coverage levels of the M user equipments, comprising:

4. The method of claim 1 or 2, wherein the base station determines the scheduling range of each user equipment according to the coverage levels of the M user equipments, comprising:

5. The method of claim 1 or 2, wherein the method further comprises:

6. The utility model provides a scheduling device of physical channel resource which characterized in that, is applied to the narrowband thing networking, includes:

a processing unit, configured to determine, according to the coverage levels of the M user equipments, a starting resource scheduling offset time and a scheduling range of each user equipment; determining a scheduling interval corresponding to each user equipment according to the initial resource scheduling offset time and the scheduling range of each user equipment; the scheduling intervals of different coverage levels are not overlapped on a time domain;

and scheduling the NPDCCH for the user equipment in a scheduling interval corresponding to each user equipment.

7. The apparatus as claimed in claim 6, wherein said processing unit is specifically configured to:

8. The apparatus according to claim 6 or 7, wherein the processing unit is specifically configured to:

determining the number of search spaces corresponding to the coverage levels and the size of each search space according to the coverage levels corresponding to the M pieces of user equipment; determining the scheduling range of the coverage grade according to the number of the search spaces of the coverage grade and the size of each search space; wherein a size of a search space of the coverage level is positively correlated with the coverage level; the search space is a minimum period of NPDCCH allocated to the user equipment by the base station.

9. The apparatus according to claim 6 or 7, wherein the processing unit is specifically configured to:

and determining the scheduling range according to the searching capability of the device and the number of the user equipment needing to be scheduled.

10. The apparatus of claim 6 or 7, wherein the processing unit is further to:

and if the available NPDCCH is not found in the scheduling interval, the device adds the user equipment into the next scheduling period for scheduling.