WO2010067200A1 - 无线资源映射方法 - Google Patents

无线资源映射方法 Download PDF

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Publication number
WO2010067200A1
WO2010067200A1 PCT/IB2009/007922 IB2009007922W WO2010067200A1 WO 2010067200 A1 WO2010067200 A1 WO 2010067200A1 IB 2009007922 W IB2009007922 W IB 2009007922W WO 2010067200 A1 WO2010067200 A1 WO 2010067200A1
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Prior art keywords
physical resource
permutation
resource units
units
mapping
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PCT/IB2009/007922
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English (en)
French (fr)
Inventor
关艳峰
刘向宇
刘颖
方惠英
曲红云
Original Assignee
刘建
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Publication date
Application filed by 刘建 filed Critical 刘建
Priority to RU2011119252/07A priority Critical patent/RU2474979C2/ru
Priority to US13/129,472 priority patent/US8818436B2/en
Priority to EP09831542.7A priority patent/EP2355607B1/en
Priority to JP2011543842A priority patent/JP5342653B2/ja
Priority to KR1020117010852A priority patent/KR101330427B1/ko
Publication of WO2010067200A1 publication Critical patent/WO2010067200A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453Resources in frequency domain, e.g. a carrier in FDMA
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2602Signal structure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044Arrangements for allocating sub-channels of the transmission path allocation of payload
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058Allocation criteria
    • H04L5/0064Rate requirement of the data, e.g. scalable bandwidth, data priority
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0091Signaling for the administration of the divided path

Definitions

  • the present invention relates to the field of communications, and in particular, to a radio resource mapping method. Background technique
  • a base station refers to a device that provides services for a terminal, and communicates with the terminal through an uplink/downlink link, where downlink refers to the direction from the base station to the terminal, and uplink refers to the direction from the terminal to the base station.
  • downlink refers to the direction from the base station to the terminal
  • uplink refers to the direction from the terminal to the base station.
  • a plurality of terminals can simultaneously transmit data to a base station through an uplink, or can simultaneously receive data from a base station through a downlink.
  • scheduling allocation of system radio resources is performed by a base station. For example, the base station gives downlink resource allocation information when the base station performs downlink transmission, and uplink resource allocation information when the terminal performs uplink transmission.
  • the base station when scheduling a radio resource of an air interface, the base station usually takes one radio frame as a scheduling period, and divides the radio resource into a plurality of radio resource units (for example, one time slot or one codeword). Scheduling, the base station provides data or multimedia services to the terminals it covers by scheduling the radio resource unit during the scheduling period.
  • the base station divides the radio resources at each frequency point into time division multiple access with a period of 4.615 ms (Time) Division Multiple Address (TDMA) radio frame, each radio frame contains 8 time slots, one time slot can transmit one full rate or two half rate channels, and can also realize low speed data service;
  • TDMA Time Division Multiple Address
  • GPRS General Packet Radio Service
  • the data traffic rate is increased to more than 100 kbps by introducing fixed-slot-based packet switching; and Time-Division Synchronization Code is used.
  • the base station In the third generation wireless communication system represented by TD-SCDMA, the base station also divides the radio resources of the air interface into radio frames with a period of 10 ms, each of which contains 14 regular time slots and 6 special time slots, and the regular time slots. It is used to transmit specific services and signaling. On each regular time slot, the base station distinguishes users by different code words.
  • Future wireless communication systems represented by Long Term Evolution (LTE), UMB (Ultra Mobile Broadband) and IEEE 802.16m adopt Orthogonal Frequency Division Multiplexing (OFDM) and orthogonal frequency division.
  • OFDM Orthogonal Frequency Division Multiplexing
  • OFDMA Orthogonal Frequency Division Multiple Address
  • the communication traffic is getting larger and larger, which leads to the system bandwidth occupied by the wireless communication system in the future is getting larger and larger, and the continuous large bandwidth is less and less.
  • future wireless communication systems need to support multi-carrier bearers, which makes resource mapping of future radio resources more complicated.
  • QoS quality of service
  • the quality of service (QoS) requirements of different service types are different, and the requirements for radio resource units are different, especially It is a Voice over IP (VoIP) packet and a small control message.
  • VoIP Voice over IP
  • the present invention has been made in view of the problem that conventional radio resource units (such as time slots or codewords) and their corresponding sub-channelization and resource mapping processes existing in the related art cannot meet the needs of future wireless communication systems.
  • the present invention is directed to a radio resource mapping method to ensure spectral efficiency of future wireless communication systems.
  • a resource mapping method maps subcarriers to resource units by external permutation and internal permutation, and the external permutation includes:
  • n, M, and N2 are integers greater than or equal to 1, and N1 is not equal to N2, and nl is an integer greater than or equal to 0. .
  • the method further includes: mapping the n physical resource units after the external permutation operation to the frequency partition.
  • the method further includes:
  • the physical resource elements mapped to the frequency partition are divided into a centralized resource group and/or a distributed resource group by sector-specific permutation and/or direct mapping.
  • the internal replacement includes:
  • the resource units in the distributed resource group are replaced with logical distributed resource units, and the resource units in the centralized resource group are directly mapped into logical centralized resource units.
  • mapping the n physical resource units after the outer permutation operation to the frequency partition includes: mapping the n physical resource units to frequency partitions according to resource configurations.
  • the resource configuration includes one or a combination of the following: multi-carrier information, n and/or system bandwidth, frequency partition information.
  • the multi-carrier information is used to indicate at least one of the following: a number, a size, and a location of physical resource units composed of guard bands between adjacent carriers.
  • the frequency partition information includes one or a combination of the following: the number of frequency partitions, the size of the distributed resource group in the frequency partition, the size of the centralized resource group in the frequency partition, N1 or N2 or N1 and N2.
  • Mapping the n physical resource units to the frequency partition according to the resource configuration includes: performing, according to the frequency partition information, the replacement of the n physical resource units by using max (N1, N2) physical resource units Configure each frequency partition, and then replace each frequency resource unit with min ( Nl , N2 ) physical resource units.
  • n physical resource units include physical resource units composed of guard bands between adjacent carriers, when performing the external replacement, directly mapping physical resource units composed of guard bands between the adjacent carriers, And when mapping to the frequency partition, the physical resource unit composed of the adjacent inter-carrier guard band is directly mapped to the last logical centralized resource unit in the frequency partition including the logical resource group.
  • the external permutation uses one or a combination of the following: a row-column permutation, a circular permutation mapping, a uniform decimation permutation, a specific sequence permutation, or a random permutation.
  • the internal permutation uses row-column permutation; or, the internal permutation determines one or a combination of the following depending on the system bandwidth or the length of the sequence to be replaced: a row-column permutation, a circular mapping permutation, a specific sequence permutation, or a random permutation.
  • the frequency resource partition to which the n1 physical resource units directly mapped are mapped is used as a centralized resource unit.
  • the frequency selective gain and the frequency diversity gain can be obtained by causing the base station to select an appropriate resource scheduling granularity and resource unit type, thereby improving the spectral efficiency of the future wireless communication system.
  • FIG. 1 is a schematic diagram showing a frame structure of a wireless communication system according to the related art
  • FIG. 2 is a schematic diagram of resource structure of a wireless communication system in which the technology is related;
  • FIG. 3 is a schematic flowchart of a radio resource mapping method according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a resource mapping process of a 5 MHz radio communication system according to an embodiment of the present invention
  • 4a is a schematic diagram of another resource mapping process of a 5 MHz wireless communication system according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a resource mapping process of a 10 MHz wireless communication system according to an embodiment of the present invention
  • Figure 5a is a schematic diagram of a resource mapping process of a 20 MHz wireless communication system in accordance with an embodiment of the present invention
  • FIG. 6 is a schematic diagram of still another resource mapping process of a 5 MHz wireless communication system according to an embodiment of the present invention.
  • FIG. 7 is a diagram of resource mapping in a multi-carrier mode of a wireless communication system according to an embodiment of the present invention. Schematic diagram. detailed description
  • the radio resource mapping process is the process of mapping physical resources (such as physical subcarriers) into logical resources.
  • the main basis of resource mapping in a wireless communication system is the frame structure and resource structure of the wireless communication system.
  • the frame structure describes the structure of the wireless resources in the time domain in the wireless communication system
  • the resource structure describes the wireless resources in the wireless communication system. Structure on the frequency domain.
  • the frame structure In future wireless communication systems (for example, in wireless communication systems based on OFDM and OFDMA techniques), the frame structure generally has the following features: dividing radio resources into superframes, frames, subframes, and symbols for scheduling, first The radio resource is divided into time-continuous superframes, each superframe includes multiple frames, and each frame includes multiple subframes, and the sub-frame is composed of the most basic OFDM symbols, frames, sub-frames, and OFDM symbols in the superframe. The number is determined by the basic parameters of the OFDM system. In order to improve the transmission efficiency, multiple subframes may be cascaded for unified scheduling. As shown in FIG.
  • the radio resource is divided into super frames in the time domain, for example, superframe 1, superframe 2, superframe 3, and each superframe contains 4 frames, for example, frames. 1 to 4, each frame contains 8 sub-frames, for example, sub-frame 1 to sub-frame 8, and the sub-frame is composed of 6 basic OFDM symbols ( Symbol), for example, symbols 1 to 6.
  • the main features of the resource structure of the future wireless communication system are: dividing the wireless resource into frequency partitions, and each frequency partition is divided into a centralized resource region and/or a distributed resource region, as shown in FIG. 2 It is shown that the available physical subcarriers of one subframe are divided into three frequency partitions for supporting three cells, and each frequency partition includes centralized resources and distributed resources for implementing scheduling flexibility.
  • the embodiment of the present invention provides a radio resource mapping method.
  • a radio resource mapping method is provided for a wireless communication system to map subcarriers to resource units by external permutation and internal permutation.
  • a wireless communication system to map subcarriers to resource units by external permutation and internal permutation.
  • the method can be generally performed as follows: For the available bandwidth of a single carrier system, first divided into physical resource units (PUs); then, external replacement, on the one hand, the external The permutation may be performed in a resource scheduling granularity (that is, the number of PRUs used in performing the permutation operation, or may be performed in two or more different resource scheduling granularities; on the other hand, the external permutation preferably uses row-column permutation Of course, other suitable replacement methods may be adopted as needed.
  • the present invention has no limitation on this; after that, the replaced physical resource unit is mapped to the frequency partition, and then the internal replacement is performed, and the internal replacement process can be understood as internal replacement.
  • direct mapping the internal permutation will be the Logical Distributed Resource Unit (LD U), and the direct mapping will be the Logical Localized Resource Unit (LLRU).
  • LD U Logical Distributed Resource Unit
  • LLRU Logical Localized Resource Unit
  • the physical resource unit after the external replacement is mapped to the frequency partition, and the mapping process may be performed according to the resource configuration.
  • the resource configuration herein may include one or a combination of the following: multi-carrier information, number of physical resource units n and / or system bandwidth, frequency partition information.
  • the multi-carrier information is used to indicate the following information: the number, size, and location of physical resource units composed of guard bands between adjacent carriers; and the frequency partition information includes one or a combination of the following: The size of the distributed resource group in the frequency partition, the size of the centralized resource group in the frequency partition, and the granularity (unit) N when external replacement is performed, where N may be N1 (for example, 1, 2 or 4), that is, one The granularity may also be N1 (for example, 4) and N2 (for example, 1 or 2), that is, two granularities, and may be other cases, no longer here - enumeration; the size of the resource group refers to the The number of physical resource units in the resource group.
  • the granularity of channel quality feedback (the granularity refers to the number of physical resource units included), the system bandwidth, or the sequence length that needs to be replaced.
  • the row and column permutation can be: [0, 4, 8, 1 , 5, 9, 2, 6, 10, 3, 7, 11]
  • the permutation matrix is [0, 1, 2, 3; 4, 5, 6, 7; 8, 9, 10, 11] with specific Sequence permutation
  • the permutation sequence [0, 6, 3, 10, 7, 4, 1, 11, 8, 2, 5, 9] is the sequence order after substitution.
  • some variants based on rank-and-column substitution are still row-column permutations.
  • the original sequence is [0, 1, 2, 3, 4]
  • the sequence after the permutation is: 0, 3, 1, 4, 2
  • the essence is still It is a row and column permutation, that is, the first five of [0, 1, 2; 3, 4, 5].
  • the row and column permutation can obtain better dispersion, and the implementation process is simple and the complexity is low.
  • the uniform decimation permutation can be replaced by row-column permutation or equivalent to the first permutation. The row and column permutation is used, and the physical resource unit is mapped to the original order before the second replacement.
  • Circular mapping permutations, specific sequence permutations, and random permutations are not limited to the length of the permutation sequence.
  • the process of resource mapping is similar to that of a single carrier, and the multi-carrier system determines the use of the guard band on each carrier according to the multi-carrier information, for example, the number of guard bands that can be used to form a physical resource unit, etc., after that Each carrier performs resource mapping according to a single carrier resource mapping process.
  • Radio resource mapping method when performing external permutation, all physical resource units are replaced, but for logical centralized resource units, external permutation may use direct mapping, which will be described below. Description is made in the second embodiment.
  • Mode 1 Performing at a resource scheduling granularity. All n physical resource units are replaced by N1 physical resource units, and the replaced n physical resource units are mapped to a frequency partition (Frequency Partition) for subsequent internal replacement.
  • Frequency Partition Frequency Partition
  • Manner 2 First, perform a replacement operation in units of N1 physical resource units, select nl x N1 physical resource units from the sequence of n physical resource units obtained from one replacement operation, and then perform the remaining n_nl x Nl physical
  • the resource unit performs a secondary replacement operation in units of N2, and maps the n physical resource units after the second replacement to the frequency partition, where n, nl, N1, and N2 are integers greater than or equal to 1, and N1 is not Equal to N2, preferably, can be set to N1>N2. In this way, it is ensured that all the physical resource units are consecutive when the replacement is performed in units of N1 physical resource units, and there is no restriction on the subsequent replacement by N2 physical resource units.
  • the external permutation and internal permutation mentioned in the embodiments of the present invention are for the process, not for the specific operation, the external permutation includes the permutation operation, and may also include the direct mapping operation.
  • the internal permutation includes The permutation operation may also include a direct mapping operation.
  • the implementation process of the radio resource mapping method of the first embodiment is further illustrated by an example.
  • Figure 4 shows the resource mapping process of an embodiment of the invention under a 5 MHz wireless communication system.
  • the six parts of 0 to 5 are externally replaced by row-column permutation, that is, the permutation matrix described above, the permutation matrix is [0, 1, 2; 3, 4, 5], and the order of replacement is 0, 3, 1, 4, 2, 5, as shown by 3 in Figure 4.
  • the permutation matrix is a 4x4 matrix, and the order of substitution is 4, 16, 8, 20, 5, 17, 9, 21, 6, 18, 10, 22, 7, 19, 11, 23. As shown by 5 in Figure 4.
  • the physical resource unit after the above external replacement is allocated to the frequency partition (Frequency Partition), as shown by 6 in FIG. 4, and directly mapped to the centralized resource group and the distributed resource group, as shown in FIG. Shown.
  • the physical resource units within the frequency partition can also be divided into a centralized resource group and/or a distributed resource group by sector-specific permutation and direct mapping, or can be implemented separately using sector-specific permutations.
  • the entire subframe is divided into three frequency partitions according to the resource configuration information.
  • the frequency partition 1 includes eight physical resource units, and the first four physical resource units form a centralized type.
  • a resource group (or a centralized area), the last four physical resource units form a distributed resource group;
  • the frequency partition 2 includes 12 physical resource units, wherein the first 10 physical resource units form a centralized resource group, and then Two physical resource units form a distributed resource group;
  • frequency partition 3 includes four physical resource units, and the four physical resource units form a centralized resource group.
  • the frequency partition can include a centralized resource group and a distributed resource group, or only a centralized resource group, or only a distributed resource group.
  • each frequency partition is configured by max (N1, N2), that is, 4 physical resource units, and then min. (Nl, N2), that is, one physical resource unit is a unit Configure each frequency partition.
  • the centralized resource group in the frequency partition 2 requires four physical resource units in the external mapping, and other centralized resource groups and distributed resource groups require one physical resource unit in the external mapping. .
  • LRU logical resource unit
  • the process of internal permutation replaces the distributed resource group with a logical distributed resource unit (LDRU).
  • LDRU logical distributed resource unit
  • the resource elements in the distributed resource group of the downlink are mapped to the downlink logical distribution by subcarrier permutation.
  • a Logical Localized Resource Unit (LL U ) maps resource elements in an uplink distributed resource group to an uplink logical distributed resource unit through a Tile Replacement. Based on this, for the downlink centralized resource group, the resource unit is directly mapped to the logical centralized resource unit, and for the downlink distributed resource unit, the data subcarrier in the distributed resource group is replaced by the circular permutation mapping.
  • the permuted sequence is [0, 3, 1, 2, 4, 5]. Essentially, such a permutation sequence belongs to a particular permutation or is equivalent to the first permutation using row and column permutation, and the physical resource unit is mapped to the original order prior to the second permutation, as shown in Figure 4a.
  • Figure 5 shows the resource mapping process of an embodiment of the present invention under a 10 MHz wireless communication system. Details that are the same or similar to those of the first embodiment will not be described here.
  • the 12 parts of 0 to 11 are externally replaced by row and column permutation, that is, the above-mentioned primary permutation, the permutation matrix is 4 x 3, and the order after replacement is 0, 4, 8, 1, 5, 9, 2, 6, 10, 3, 7, 11. As shown by 3 in Figure 5.
  • the remaining 36 physical resource units are divided into units of one physical resource unit, and the outer permutation is performed by row-column permutation, that is, the above-mentioned secondary permutation, the permutation matrix is a 6 x 6 matrix, and the result of the replacement is as shown in the figure. 5 of 5 is shown.
  • the physical resource unit that has undergone the above external replacement is allocated to the frequency partition according to the base station configuration information and/or the partition configuration information, as shown by 6 in FIG. 5, and directly mapped to the centralized resource group and the distributed resource group. As shown in 7 of Figure 5.
  • the frequency partition 1 has a total of 16 physical resource units, the first 8 physical resource units constitute a centralized resource group, and the last 8 physical resource units constitute a distributed resource group; 2 A total of 16 physical resource units, wherein the first 8 physical resource units form a centralized resource group, and the last 8 physical resource units form a distributed resource group; the frequency partition 3 has a total of 16 physical resource units, and the first 8 physical resource units The centralized resource group is composed, and the last 8 physical resource units form a distributed resource group.
  • FIG. 5a shows the resource mapping process of an embodiment of the invention under a 20 MHz wireless communication system.
  • n2 2 that is, two physical resource units perform the above-described second replacement operation for the replacement unit, and the second replacement unit for the external replacement is replaced with the circular map. Details that are the same or similar to those of the first embodiment will not be described here.
  • all physical resource units are replaced when external replacement is performed, but the present invention is not limited thereto, and when external replacement is performed, part of physical resource units may also be used, for example Directly map a centralized resource unit and replace another physical resource unit. It should be noted that when the physical resource unit that performs direct mapping during external replacement is mapped to the frequency partition, it can only be located as a centralized resource unit in the centralized area. The invention can be better understood by the examples given in Figure 6.
  • Figure 6 shows the resource mapping process of an embodiment of the invention under a 5 MHz wireless communication system, in which external permutation includes direct mapping.
  • the 24 physical resource units are divided into 4 physical resource units, and are divided into 0 to 5 total 6 parts.
  • three parts of 0, 1, and 2 that is, physical resource units 0, 1 , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 are directly mapped to the logical centralized resource unit, and the remaining physical resource units, that is, the physical resource units in the three parts of 3, 4, and 5 are 12, 13, and 14 respectively.
  • 15 , 16, 17, 18 , 19, 20, 21 , 22, 23 external substitution by row and column permutation in units of one physical resource unit, the permutation matrix is 3 x 4, and the result after replacement is 12 , 16, 20, 13, 17, 21, 14, 18, 22, 15, 19, 23.
  • the externally replaced physical resource unit is preferably allocated according to the partition configuration information.
  • each frequency partition includes eight physical resource units, and the first four physical resource units form a centralized resource group, and the last four physical resource units form a distributed resource group. It can be seen that the physical resource unit included in the three parts of the direct mapping is located in the centralized area as a centralized resource unit when mapped to the frequency partition, specifically, the physical resource unit 0, 1 included in the 0 part.
  • 2, 3 consists of a centralized resource group of frequency partition 1, a part of the included physical resource unit 4, 5, 6, 7 constitutes a centralized resource group of frequency partition 2, and 2 parts include physical resource units 8, 9, 10, 11 A centralized resource group that constitutes frequency partition 3.
  • the above-mentioned centralized resource group is directly mapped to a logical centralized resource unit when performing internal replacement.
  • the processing of the directly mapped centralized resource unit (ie, 0 ⁇ 11) in the external replacement process when mapping to the frequency partition is not limited to the above, for example, the resource unit may be mapped to different frequencies.
  • the partitions, 8, 9 are in the frequency partition 2, 10, 11 in the frequency partition 3, etc.
  • various modifications and modifications can be made to the frequency mapping process in accordance with the teachings of the present invention, all within the scope of the present invention.
  • the n physical resource units mentioned in the first embodiment and the second embodiment do not include physical resource units consisting of guard bands between adjacent carriers, and physical resources composed of guard bands between adjacent carriers. The case of the unit will be described in the third embodiment below.
  • the physical resource unit that performs direct mapping can only be located in the centralized resource group when mapping to the frequency partition, and directly mapped to the logical centralized group when performing external permutation. Resource unit. The embodiment is described below in conjunction with FIG. 7 in conjunction with Example 4. Three technical solutions.
  • FIG. 7 shows a resource mapping process of an embodiment of the present invention in a multi-carrier mode.
  • there are two adjacent 5MHz systems and the partially overlapping protected subcarriers in the middle are used for resource mapping for data transmission.
  • the protection subcarriers that is, 24 and 25 as shown in FIG. 7, when external replacement is performed.
  • These two physical resource units are directly mapped and used for centralized resource units.
  • the last physical resource unit is not necessarily the same as the number of sub-carriers that are pre-defined (for example, specified by a standard or protocol), for example, the physical resources in this example.
  • Unit 25 contains fewer subcarriers than physical resource unit 0, which is determined by the number of available guard subcarriers.
  • the permutation matrix here is [0, 1 , 2; 3 , 4, 5], and the order of substitution is 0, 3, 1, 4, 2, 5.
  • a total of 2 x 4 8 physical resource units, which are 0, 1, 2, 3, 12, 13, 14, 15, respectively.
  • the permutation matrix is a 4 ⁇ 4 matrix, and the order of replacement is 4, 16, 8, 20, 5, 17, 9, 21, 6, 18, 10, 22, 7, 19, 11 , 23. This completes the external permutation.
  • the externally replaced physical resource unit is allocated into a frequency partition (Frequency Partition), and is divided into a centralized area and a distributed area according to base station configuration information and/or partition configuration information. As shown in FIG. 7, there are three frequency partitions, and the directly mapped physical resource units 24 and 25 are located in the frequency partition 3 and are located in the centralized area in the frequency partition 3.
  • Frequency Partition Frequency Partition
  • the distributed resource unit completes the resource mapping process when there is a physical resource unit formed by the protection subcarrier in the multi-carrier mode.
  • the present invention proposes a new radio resource mapping method based on the characteristics of future wireless communication systems to support future wireless communication systems and standardize the resource mapping process of its radio resource units, thereby ensuring future wireless communication systems.
  • the flexibility of radio resource scheduling improves the scheduling efficiency of radio resources, ultimately guarantees the QoS of various service types, and ensures the frequency efficiency of future wireless communication systems.
  • the above steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. They can be implemented by program code executable by the computing device, so that they can be stored in the storage device by the computing device, or they can be made into individual integrated circuit modules, or multiple modules of them. Or the steps are made into a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.

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Abstract

提供了一种资源映射方法,其中无线通信系统通过外部置换和内部置换将子载波映射到资源单元。该外部置换包括:以N1个物理资源单元为单位对n个物理资源单元进行一次置换操作,从该一次置换操作得到的n个物理资源单元中顺序选择n1 x N1个物理资源单元,再对剩余的n - n1 x N1个物理资源单元以N2个物理资源单元为单位进行二次置换操作;其中, n、N1、N2均为大于或等于1的整数,且N1不等于N2,n1为大于或等于0的整数。本发明通过使基站选择合适的资源调度粒度和资源单元类型,可以得到频率选择性增益和频率分集增益,从而提高未来无线通信系统的频谱效率。

Description

无线资源映射方法 技术领域
本发明涉及通信领域, 尤其涉及一种无线资源映射方法。 背景技术
在无线通信系统中, 基站是指为终端提供服务的设备, 其通过上 /下行 链路与终端进行通信, 其中, 下行是指基站到终端的方向, 而上行是指终 端到基站的方向。 就数据传输而言, 多个终端可以通过上行链路同时向基 站发送数据, 也可以通过下行链路同时从基站接收数据。 在采用基站实现 无线资源调度控制的无线通信系统中, 系统无线资源的调度分配由基站完 成。 例如, 由基站给出基站进行下行传输时的下行资源分配信息以及终端 进行上行传输时的上行资源分配信息等。
在已商用的无线通信系统中, 基站在调度空口的无线资源时, 通常以 一个无线帧为一个调度周期, 并将无线资源分成若干个无线资源单元 (例 如, 一个时隙或一个码字) 进行调度, 基站在调度周期内通过调度无线资 源单元向其覆盖的终端提供数据或多媒体服务。 例如, 在以全球移动通信 系统 ( Global System for Mobile communication, GSM ) 为代表的第二代无 线通信系统中, 基站将每个频点上的无线资源分成以 4.615ms 为周期的时 分多址(Time Division Multiple Address, TDMA )无线帧, 每个无线帧包含 8个时隙, 一个时隙可以传送一个全速率或两个半速率的话路, 也可以实现 低速的数据业务; 在以通用无线分组服务(General Packet Radio Service, GPRS ) 为代表的 2.5代无线通信系统中, 通过引入基于固定时隙的分组交 换将数据业务速率提高到 100kbps 以上; 而在以时分同步码分多址 ( Time-Division Synchronization Code Division Multiple Address, TD-SCDMA ) 为代表的第三代无线通信系统中, 基站同样将空口的无线资 源分成以 10ms为周期的无线帧,每个 10ms包含 14个常规时隙和 6个特殊 时隙, 常规时隙用于传输具体的业务和信令, 在每个常规时隙上, 基站通 过不同的码字来区分用户。
以长期演进 ( Long Term Evolution , LTE )、 UMB ( Ultra Mobile Broadband )和 IEEE 802.16m为代表的未来无线通信系统由于采用了正交频 分复用 ( Orthogonal Frequency Division Multiplexing, OFDM ) 和正交频分 多址 ( Orthogonal Frequency Division Multiple Address, OFDMA )技术, 为 提供高速数据和流畅多媒体业务提供了技术上的保障, 但同时也对无线资 源管理提出了新的约束。
首先, 通信业务量越来越大, 这导致未来无线通信系统占用的系统带 宽越来越大, 而连续的大带宽越来越少。 这样, 为了充分利用分散的频率 资源, 未来无线通信系统需要支持多载波承载, 这使得未来无线资源的资 源映射更加复杂。 其次, 为了支持不同类型或不同能力的终端, 未来需要 支持的业务类型越来越多, 而不同业务类型的服务质量( Quality of Service, QoS )需求不同,对无线资源单元的需求也不同,尤其是 IP语音( Voice over IP, VoIP )数据包和小的控制类消息; 另外, 干扰已经成为了制约无线通信 系统发展的主要因素, 而为了支持部分频率复用 ( Fractional Frequency Reuse, FF ) 等干扰抑制措施、 EMBS等业务, 也必须采用新的资源映射 方法; 最后, 无线通信的信道环境通常会发生变化, 而且资源单元也有多 种类型, 例如集中式资源单元和分布式资源单元, 这一变化也要求资源映 射能够支持这些新的特点。
因此, 传统的无线资源单元 (如时隙或码字)及其相应的子信道化和 资源映射过程已经不能满足未来无线通信系统的需要, 为确保未来无线通 信系统的频谱效率, 有必要设计一种新的无线资源的子信道化和资源映射 方法。 发明内容
考虑到相关技术中存在的传统的无线资源单元 (如时隙或码字)及其 相应的子信道化和资源映射过程已经不能满足未来无线通信系统的需要的 问题而作出本发明, 为此, 本发明旨在提出一种无线资源映射方法, 以确 保未来无线通信系统的频谱效率。
根据本发明的一个方面, 提供了一种资源映射方法, 一种无线资源映 射方法, 无线通信系统通过外部置换和内部置换将子载波映射到资源单元, 所述外部置换包括:
以 N1个物理资源单元为单位对 n个物理资源单元进行一次置换操作, 从所述一次置换操作得到的 n个物理资源单元中顺序选择 nl X N1个物理资 源单元, 再对剩余的 n - nl x Nl 个物理资源单元以 N2个物理资源单元为 单位进行二次置换操作, 其中, n、 M、 N2均为大于或等于 1 的整数, 且 N1不等于 N2, nl为大于或等于 0的整数。
在所述外部置换后, 所述方法还包括: 将外部置换操作后的所述 n个 物理资源单元映射到频率分区。
在映射到所述频率分区后, 所述方法还包括:
将映射到所述频率分区的所述物理资源单元通过扇区特定置换和 /或直 接映射分为集中式资源组和 /或分布式资源组。
所述内部置换包括:
将所述分布式资源组中的资源单元置换为逻辑分布式资源单元, 将所 述集中式资源组中的资源单元直接映射为逻辑集中式资源单元。
对剩余的 n _ nl x Nl 个物理资源单元以 N2个物理资源单元为单位进 行二次置换操作之前将 n - nl X N1个物理资源单元映射为原顺序或不映射 为原顺序。 将外部置换操作后的所述 n个物理资源单元映射到频率分区包括: 根 据资源配置将所述 n个物理资源单元映射到频率分区。
所述资源配置包括以下之一或其组合: 多载波信息、 n和 /或系统带宽、 频率分区信息。
所述多载波信息用于指示如下信息至少之一: 相邻载波间的保护频带 组成的物理资源单元的数目、 大小、 位置。
所述频率分区信息包括以下之一或其组合: 频率分区数目、 频率分区 中分布式资源组的大小、 频率分区中集中式资源组的大小、 N1或者 N2或 者 N1及 N2。
根据资源配置将所述 n个物理资源单元映射到频率分区包括: 根据所 述频率分区信息, 对于所述 n个物理资源单元, 首先以 max ( Nl, N2 )个 物理资源单元为单位进行置换并配置各频率分区, 再以 min ( Nl , N2 )个 物理资源单元为单位进行置换并配置各频率分区。
如果所述 n个物理资源单元包括相邻载波间的保护频带组成的物理资 源单元, 则在进行所述外部置换时, 对所述相邻载波间的保护频带组成的 物理资源单元进行直接映射, 并且在映射到所述频率分区时, 将所述相邻 载波间保护频带组成的物理资源单元直接映射到最后一个包含逻辑资源组 的频率分区中的逻辑集中式资源单元。
其中, 所述 N1>N2。
所述外部置换采用下列之一或其组合: 行列置换、 圆置换映射、 均匀 抽取置换、 特定序列置换或随机置换。
所述内部置换采用行列置换; 或者, 所述内部置换根据系统带宽或者 需要置换的序列长度决定采用下列之一或其组合: 行列置换、 圓映射置换、 特定序列置换或随机置换。
一种无线资源映射方法, 无线通信系统通过外部置换和内部置换将子 载波映射到资源单元, 所述外部置换包括:
以 N1个物理资源单元为单位对 n个物理资源单元中的 nl个集中式物 理资源单元进行直接映射,以 N2个物理资源单元为单位对剩余的 n _ nl个 物理资源单元进行置换操作, 并将经过直接映射和置换后的所述 n个物理 资源单元映射到频率分区,
其中, 经过直接映射的所述 nl个物理资源单元映射到的所述频率分区 中作为集中式资源单元。
通过本发明的上述至少一个技术方案, 通过使得基站选择合适的资源 调度粒度和资源单元类型, 可以得到频率选择性增益和频率分集增益, 从 而提高未来无线通信系统的频谱效率。 附图说明
图 1是根据相关技术的无线通信系统的帧结构示意图;
图 2是才 M居相关技术的无线通信系统的资源结构示意图;
图 3是根据本发明实施例的无线资源映射方法的流程示意图; 图 4是根据本发明实施例的 5MHz无线通信系统的资源映射过程示意 图;
图 4a是根据本发明实施例的 5MHz无线通信系统的另一资源映射过程 示意图;
图 5是根据本发明实施例的 10MHz无线通信系统的资源映射过程示意 图;
图 5a是根据本发明实施例的 20MHz无线通信系统的资源映射过程示 意图;
图 6是根据本发明实施例的 5MHz无线通信系统的再一资源映射过程 示意图;
图 7是 #居本发明实施例的无线通信系统在多载波模式的资源映射过 程示意图。 具体实施方式
在描述本发明实施例之前, 首先对无线通信系统中无线资源的资源映 射过程进行简要说明。
简单地说, 无线资源映射过程就是将物理资源 (如物理子载波) 映射 为逻辑资源的过程。 无线通信系统中的资源映射的主要依据是该无线通信 系统的帧结构和资源结构, 帧结构描述了无线通信系统中无线资源在时域 上的结构, 资源结构描述了无线通信系统中无线资源在频域上的结构。 在 未来的无线通信系统中 (例如, 以 OFDM和 OFDMA技术为基础的无线通 信系统中), 帧结构一般具有如下特征: 将无线资源划分成超帧、 帧、 子帧 和符号进行调度, 首先将无线资源划分为时间连续的超帧, 每个超帧包含 多个帧, 每个帧又包含多个子帧, 子帧由最基本的 OFDM符号组成, 超帧 中的帧、 子帧以及 OFDM符号的数目由 OFDM系统的基本参数决定, 为了 提高传输效率, 可以将多个子帧进行级联进行统一调度。 如图 1 所示, 无 线资源在时域上划分为超帧(Super frame ), 例如, 超帧 1、 超帧 2、 超帧 3 , 每个超帧包含 4个帧 (Frame ), 例如, 帧 1〜帧 4, 每个帧包含 8个子帧 ( Subframe ), 例如, 子帧 1 ~子帧 8, 而子帧又由 6个基本的 OFDM符号 ( Symbol )组成, 例如, 符号 1〜符号 6。
而未来的无线通信系统的资源结构的主要特征是: 将无线资源分成多 个频率分区 ( Frequency Partition ), 每个频率分区内被分成集中式资源区域 和 /或分布式资源区域, 如图 2所示, 一个子帧的可用物理子载波被分成 3 个频率分区, 用于支持三个小区, 每个频率分区分中都包括集中式资源和 分布式资源用于实现调度的灵活性。 根据未来无线无线通信系统中帧结构 和资源结构的特点, 本发明实施例提出了一种无线资源映射方法。
下面将结合实施例并参照附图来详细描述本发明。 需要说明的是, 在 根据本发明实施例, 提供了无线资源映射方法, 用于无线通信系统通 过外部置换和内部置换将子载波映射到资源单元。 一般地, 如图 3 所示, 该方法大致可以如下进行: 对于单载波系统的可用带宽, 首先划分为物理 资源单元 (Physical Resource Unit, P U ); 然后, 进行外部置换, 一方面, 这里的外部置换可以以一种资源调度粒度(即, 进行置换操作时所使用的 PRU 的个数来进行, 也可以以两种以上的不同资源调度粒度来进行; 另一 方面, 外部置换优选的采用行列置换, 当然, 也可以根据需要采用其他合 适的置换方式, 本发明对此没有限制; 之后, 将置换后的物理资源单元映 射到频率分区, 接下来进行内部置换, 内部置换的过程可以理解为内部置 换和直接映射, 内部置换得到的将是逻辑分布式资源单元 ( Logical Distributed Resource Unit, LD U ), 而直接映射得到的将是逻辑集中式资源 单元 ( Logical Localized Resource Unit, LLRU )。
经过外部置换后的物理资源单元在映射到频率分区时, 可以根据资源 配置来进行该映射过程 , 具体地 , 这里的资源配置可以包括以下之一或其 组合: 多载波信息、 物理资源单元的数目 n和 /或系统带宽、 频率分区信息。 在上述信息中, 多载波信息用于指示如下信息: 相邻载波间的保护频带组 成的物理资源单元的数目、 大小、 位置; 而频率分区信息又包括以下之一 或其组合: 频率分区数目、 频率分区中分布式资源组的大小、 频率分区中 集中式资源组的大小、 进行外部置换时的粒度(单位) N, 这里的 N可以 是 N1 (例如, 1, 2或 4 ), 即, 一种粒度, 也可以是 N1 (例如, 4 )及 N2 (例如, 1或 2 ), 即, 两种粒度, 还可以是其他情况, 在此不再——列举; 资源组的大小指的是该资源组中物理资源单元的数量。
而对于外部置换而言, 其可以根据信道质量反馈的粒度(粒度指包括 的物理资源单元的数目 )、 系统带宽或需要进行置换的序列长度选择使用下 列之一或其组合: 行列置换、 圆置换映射、 均匀抽取置换、 特定序列置换 和随机置换; 而对于内部置换而言, 其可以根据系统带宽或需要进行置换 的序列长度选择使用下列之一或其组合: 行列置换、 圓映射置换、 特定序 列置换和随机置换。 例如, 若原序列为 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11], 置换长度为 12, 采用行列置换可以为: [0, 4, 8, 1, 5, 9, 2, 6, 10, 3, 7, 11], 置换矩阵为 [0, 1, 2, 3; 4, 5, 6, 7; 8, 9, 10, 11], 釆用特定序列置换, 置换序列 [0, 6, 3, 10, 7, 4, 1, 11, 8, 2, 5, 9]就是置换后的序列顺序。 原则上, 对于一些基于行列置换的变种仍属 行列置换, 如, 原序列为 [0, 1, 2, 3, 4], 置换后的序列为: 0, 3, 1, 4, 2, 本质仍是行列置换, 即 [0, 1, 2; 3, 4, 5]的前 5个。 对于置换的 序列长度比较小的情况而言, 使用行列置换能够获得较好的离散性, 且实 现过程简单, 复杂度较低, 另外, 均匀抽取置换可以用行列置换代替或者 等价于第一置换采用行列置换, 而二次置换之前先对物理资源单元映射为 原顺序。 例如, 若外部置换中的原序列为 [0, 1, 2, 3, 4, 5], 间距为 2 的均匀抽取置换后的序列为: [0, 2, 4, 1, 3, 5], 此时等价于 [0, 1; 2, 3; 4, 5]的行列置换。 而圆映射置换、 特定序列置换和随机置换对于置换序 列的长度则没有限制。
对于多载波系统, 资源映射的过程与单载波类似, 多载波系统才艮据多 载波信息确定每个载波上保护频带的使用情况, 例如, 可以用于形成物理 资源单元的保护频带数量等, 之后, 每个载波按照单载波的资源映射过程 进行资源映射。
实施例一
在该实施例提供的无线资源映射方法中, 在进行外部置换时, 对于全 部的物理资源单元都进行置换, 但对于逻辑的集中式资源单元, 外部置换 可以釆用直接映射, 这将在下面的实施例二中进行描述。 如上所述, 在进 行外部置换时, 可以有多种方式, 例如, 包括但不限于如下的两种: 方式一: 以一种资源调度粒度进行。 以 N1个物理资源单元为单位对全 部的 n个物理资源单元进行置换操作, 并将置换后的 n个物理资源单元映 射到频率分区 ( Frequency Partition ), 以进行后续的内部置换。
方式二: 首先以 N1个物理资源单元为单位进行一次置换操作, 从一次 置换操作得到的 n个物理资源单元顺序中选择 nl x Nl个物理资源单元,再 对剩余的 n _ nl x Nl个物理资源单元以 N2为单位进行二次置换操作, 并 将二次置换后的 n个物理资源单元映射到频率分区, 其中, n、 nl、 Nl、 N2均为大于或等于 1的整数,且 N1不等于 N2,优选的,可以设置为 N1>N2。 这样,能够保证以 N1个物理资源单元为单位进行置换时所有物理资源单元 是连续的,而且对后续的以 N2个物理资源单元为单位进行的置换没有任何 限制。
需要说明的是, 在本发明实施例中提到的外部置换和内部置换是针对 过程而言, 而不是针对具体操作, 外部置换包括置换操作, 还可以包括直 接映射操作, 类似地, 内部置换包括置换操作, 还可以包括直接映射操作。 为了不必要地混淆本发明, 进行以上说明, 但这不影响本发明的本质, 也 不应理解为构成对本发明的任何限制。
以下进一步通过实例来说明实施例一的无线资源映射方法的实现过 程。
实例 1
图 4给出了在 5MHz无线通信系统下的本发明实施例的资源映射过程。 其中, 5MHz系统的 FFT点数为 512, 子帧内可用子载波为 432个, 共分成 n = 24个物理资源单元, 每个大小为 18 x 6, 如图 4中的①所示。 将 24个 物理资源单元以 4个物理资源单元 (即, Nl=4 ) 为单位进行划分, 划分为 0 ~ 5共 6部分, 如图 4中的②所示。 接下来, 对 0~ 5这 6个部分采用行列置换进行外部置换, 即, 上文所 述的一次置换, 置换矩阵为 [0, 1, 2; 3, 4, 5], 置换后的顺序为 0, 3, 1, 4, 2, 5, 如图 4中的③所示。 之后, 按先后顺序取出 0和 3两个部 分(即, nl=2), 共 2x4 = 8个物理资源单元, 分别是 0, 1, 2, 3, 12, 13, 14, 15。 如图 4中的④所示。
将剩余的 n - nl = 24 _ 8 = 16个物理资源单元以 1个物理资源单元为单 位 (即, N2=l) 进行划分, 采用行列置换进行外部置换, 即, 上文所述的 二次置换, 置换矩阵为 4x4矩阵, 置换后的顺序为 4, 16, 8, 20, 5, 17, 9, 21, 6, 18, 10, 22, 7, 19, 11, 23。 如图 4中的⑤所示。
将进行了上述外部置换后的物理资源单元分配到频率分区 ( Frequency Partition ) 内, 如图 4中的⑥所示, 并直接映射到集中式资源组和分布式资 源组, 如图 4 中的⑦所示。 优选地, 也可以通过扇区特定置换和直接映射 来将频率分区内的物理资源单元分为集中式资源组和 /或分布式资源组, 还 可以单独使用扇区特定置换来实现。
在本实施例中, 根据资源配置信息为将整个子帧分成 3 个频率分区, 具体地, 如图 4所示, 频率分区 1 包括 8个物理资源单元, 前 4个物理资 源单元组成一个集中式资源组(或者称为集中式区域), 后 4个物理资源单 元组成一个分布式资源组; 频率分区 2包括 12个物理资源单元, 其中, 前 10个物理资源单元组成一个集中式资源组, 后 2个物理资源单元组成一个 分布式资源组; 频率分区 3 包括 4个物理资源单元, 该 4个物理资源单元 组成一个集中式资源组。 可以看出, 频率分区中可以包括集中式资源组和 分布式资源组, 也可以只包括集中式资源组, 还可以只包括分布式资源组。
另外需要说明的是, 对于映射到频率分区的物理资源单元, 优选地, 可以根据频率分区信息, 首先以 max (Nl, N2 ), 即 4个物理资源单元为 单位配置各频率分区, 再以 min (Nl, N2), 即, 1个物理资源单元为单位 配置各频率分区。 具体的, 频率分区 2 中的集中式资源组要求在进行外部 映射时以 4个物理资源单元为单位, 其它集中式资源组和分布式资源组要 求在外部映射时以 1个物理资源单元为单位。
接下来, 进行内部置换, 得到逻辑资源单元 (Logical Resource Unit, LRU )如图 4 中的⑧所示。 内部置换的过程将分布式资源组置换为逻辑分 布式资源单元(Logical Distributed Resource Unit, LDRU ), 具体地, 将下 行链路的分布式资源组中的资源单元通过子载波置换映射为下行逻辑分布 式资源单元 ( Logical Localized Resource Unit, LL U ), 将上行链路的分布 式资源组中的资源单元经过 Tile置换映射为上行逻辑分布式资源单元。 基 于此, 对于下行集中式资源组而言, 其中的资源单元直接映射为逻辑集中 式资源单元, 而对于下行分布式资源单元, 则通过圓置换映射将分布式资 源组内的数据子载波进行置换操作, 圆置换公式为 j, = ( a*j+s ) mod Nsc, Nsc为分布式资源组内的数据子载波的总数, a与 Nsc互质, s为属于 0 ~ Nsc之间的数, j代表内部置换前子载波的序号, 从 0 ~ Nsc, j, 为圆置换 后的序号。
至此, 经过外部置换和内部置换后, 得到逻辑集中式资源单元和逻辑 分布式资源单元, 完成了 5MHz无线通信系统下的资源映射过程。
在外部置换的第一次置换中, 如若釆用均匀抽取置换, 当间距为 2时, 置换后的序列为 [0, 3 , 1 , 2, 4, 5]。 本质上这种置换序列属于特定置换或 者等价于第一置换采用行列置换, 而二次置换之前先对物理资源单元映射 为原顺序, 如图 4a所示。
实例 2
图 5 给出了在 10MHz无线通信系统下的本发明实施例的资源映射过 程。 对于与实例一相同或相似的细节, 在此将不再描述。
其中, 10MHz系统的 FFT ( Fast Fourier Transform )点数为 1024, 子帧 内的可用子载波为 864个, 分成 0 ~ 47共 48个物理资源单元, 如图 5中的 ①所示, 每个物理资源单元的大小为 18 x 6。 与图 4相似, 将 48个物理资 源单元以 4个物理资源单元(Nl=4 ) 为单位进行划分, 划分为 0 ~ 11共 12 部分, 如图 5中的②所示。
之后 , 对 0 ~ 11这 12个部分采用行列置换进行外部置换, 即, 上述的 一次置换, 置换矩阵为 4 x 3, 置换后的顺序为 0, 4, 8, 1, 5, 9, 2, 6, 10, 3, 7, 11。 如图 5中的③所示。
按先后顺序取出 0、 4和 8这三个部分, 共 3 X 4 = 12个物理资源单元, 分别是 00, 01, 02, 03, 16, 17, 18, 19, 32, 33, 34, 35。 如图 5中的 ④所示。
将剩余的 36个物理资源单元以 1个物理资源单元为单位进行划分, 釆 用行列置换进行外部置换, 即, 上述的二次置换, 置换矩阵为 6 x 6矩阵, 完成置换后的结果如图 5中的⑤所示。
将进行了上述外部置换后的物理资源单元根据基站配置信息和 /或分区 配置信息分配到频率分区内, 如图 5 中的⑥所示, 并直接映射到集中式资 源组和分布式资源组, 如图 5 中的⑦所示。 在本实施例中, 共有 3个频率 分区, 其中, 频率分区 1共 16个物理资源单元, 前 8个物理资源单元组成 集中式资源组, 后 8个物理资源单元组成分布式资源组; 频率分区 2共 16 个物理资源单元, 其中, 前 8个物理资源单元组成集中式资源组, 后 8个 物理资源单元组成分布式资源组; 频率分区 3共 16个物理资源单元, 前 8 个物理资源单元组成集中式资源组, 后 8个物理资源单元组成分布式资源 组。
之后, 进行内部置换, 将集中式区域中的物理资源单元直接映射为逻 辑集中式资源单元, 将分布式区域中的物理资源单元置换为逻辑分布式资 源单元, 如图 5中的⑧所示。 图 5a给出了在 20MHz无线通信系统下的本发明实施例的资源映射过 程。 该处理过程中与上述的各个处理的主要区别在于, n2 = 2 , 即 2个物理 资源单元为置换单位进行上述的第二置换操作, 且外部置换中的第二置换 釆用圆映射置换。 对于与实例一相同或相似的细节, 在此将不再描述。
至此, 经过外部置换和内部置换后, 得到逻辑集中式资源单元和逻辑 分布式资源单元, 完成了资源映射过程。
实施例二
在以上给出的实施例中, 在进行外部置换时, 对全部的物理资源单元 都进行了置换, 但是, 本发明不限于此, 在进行外部置换时, 还可以对部 分的物理资源单元, 例如, 对集中式资源单元进行直接映射, 对另一部分 物理资源单元进行置换。 需要说明的是, 在进行外部置换时进行直接映射 的物理资源单元在后续映射到频率分区时, 只能作为集中式资源单元位于 集中式区域。 通过图 6给出的实例可以更好地理解本发明。
实例 3
图 6给出了在 5MHz无线通信系统下的本发明实施例的资源映射过程, 在该过程中, 外部置换包含直接映射。
与图 4所示的实例 1类似, 将 24个物理资源单元以 4个物理资源单元 为单位进行划分, 划分为 0 ~ 5共 6部分。 与实例 1不同的是, 在该实例 3 中, 如图 6所示, 将 0、 1、 和 2这三个部分, 即, 物理资源单元 0, 1 , 2 , 3 , 4, 5 , 6, 7, 8, 9, 10 , 11经过直接映射用于逻辑集中式资源单元, 剩 余的物理资源单元, 即, 3、 4、 5 这三个部分中的物理资源单元, 分别是 12 , 13 , 14, 15 , 16, 17, 18 , 19, 20, 21 , 22, 23 , 以 1 个物理资源单 元为单位采用行列置换进行外部置换, 置换矩阵为 3 x 4, 置换后的结果为 12 , 16, 20, 13, 17, 21 , 14, 18, 22, 15, 19, 23。
类似地, 将外部置换后的物理资源单元优选的根据分区配置信息分配 到频率分区内, 并直接映射到集中式资源组和分布式资源组。 一共有 3 个 频率分区, 每个频率分区都包括 8个物理资源单元, 且前 4个物理资源单 元组成集中式资源组, 后 4个物理资源单元组成分布式资源组。 可以看出, 对于直接映射的三个部分所包括的物理资源单元, 在映射到频率分区时是 作为集中式资源单元位于集中式区域中, 具体地, 0部分包括的物理资源单 元 0, 1 , 2 , 3组成频率分区 1的集中式资源组, 1部分包括的物理资源单 元 4, 5, 6, 7组成频率分区 2的集中式资源组, 2部分包括的物理资源单 元 8 , 9, 10, 11组成频率分区 3的集中式资源组。 上述的集中式资源组在 进行内部置换时直接映射为逻辑集中式资源单元。
需要说明的是, 外部置换过程中经过直接映射的集中式资源单元(即, 0~11 ) 在映射到频率分区时的处理不限于上述情况, 例如, 可以将其中的 资源单元映射到不同的频率分区, 8, 9在频率分区 2, 10, 11在频率分区 3等; 总之, 根据本发明的思想可以对频率映射过程进行各种变型和修改, 均在本发明的保护范围之内。
至此, 经过外部置换和内部置换后, 得到逻辑集中式资源单元和逻辑 分布式资源单元, 完成了 5MHz无线通信系统下的资源映射过程。
需要说明的是, 在实施例一和实施例二中提到的 n个物理资源单元不 包括相邻载波间的保护频带组成的物理资源单元, 对于存在相邻载波间的 保护频带组成的物理资源单元的情况, 将在下面的实施例三中加以描述。
实施例三
如果存在相邻载波间的保护频带组成的物理资源单元, 则在进行外部 置换时, 需要对上述物理资源单元进行直接映射, 而不进行置换。 与实施 例二中所说的外部置换中的直接映射类似, 进行直接映射的该物理资源单 元在后续映射到频率分区时只能位于集中式资源组, 在进行外部置换时直 接映射为逻辑集中式资源单元。 以下结合图 7并结合实例 4来描述实施例 三的技术方案。
实例 4
图 7示出了在多载波模式下, 本发明实施例的资源映射过程。 在该场 景下, 存在两个相邻的 5MHz 系统, 中间的部分重叠的保护子载波进行资 源映射用于传输数据。 对于第一个 5MHz系统, 除了 0 ~ 23这 24个物理资 源单元外, 还由保护子载波构成了 2个物理资源单元, 即, 如图 7所示的 24和 25, 在进行外部置换时, 这 2个物理资源单元经过直接映射后, 用于 集中式资源单元。 需要说明的是, 根据多载波配置信息, 最后一个物理资 源单元并不一定与预先规定(例如, 通过标准或协议规定) 的物理资源单 元包含的子载波数量相同, 例如, 本实例中的物理资源单元 25包含的子载 波数比物理资源单元 0少, 这由可用的保护子载波的数量决定。
接下来, 对 0 ~ 5这 6个部分采用行列置换进行外部置换, 而对 24和 25这两个物理资源单元进行直接映射。 这里的置换矩阵为 [0 , 1 , 2; 3 , 4, 5], 置换后的顺序为 0, 3, 1, 4, 2, 5。 之后, 按先后顺序取出 0和 3两 个部分, 共 2 x 4 = 8个物理资源单元, 分别是 0, 1 , 2, 3, 12 , 13 , 14, 15。
将剩余的 24 _ 8 = 16个物理资源单元以 1个物理资源单元为单位 (即, N2=l )进行划分, 采用行列置换进行外部置换, 置换矩阵为 4 x 4矩阵, 置 换后的顺序为 4, 16, 8, 20, 5, 17, 9, 21 , 6, 18 , 10, 22, 7, 19, 11 , 23。 这样完成外部置换。
将外部置换后的物理资源单元分配到频率分区 (Frequency Partition ) 内,并根据基站配置信息和 /或分区配置信息分为集中式区域和分布式区域。 如图 7所示, 共 3个频率分区, 而直接映射的物理资源单元 24和 25位于 频率分区 3 , 且位于频率分区 3中的集中式区域。
至此, 经过外部置换和内部置换后, 得到逻辑集中式资源单元和逻辑 分布式资源单元, 完成了在多载波模式下存在保护子载波构成的物理资源 单元时的资源映射过程。 该实施例中的其他细节可以参照实例 1 来理解, 对于相同或相似部分, 在此不再赘述。
综上, 可以看出, 本发明基于未来无线通信系统的特点提出了一种新 的无线资源映射方法, 以支持未来无线通信系统并规范其无线资源单位的 资源映射过程, 从而保障未来无线通信系统中无线资源调度的灵活性, 提 高无线资源的调度效率, 最终保障各种业务类型的 QoS, 确保未来无线通 信系统的频语效率。
显然, 本领域的技术人员应该明白, 上述的本发明各步驟可以用通用 的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布在多个 计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程序代 码来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 或者 将它们分别制作成各个集成电路模块, 或者将它们中的多个模块或步骤制 作成单个集成电路模块来实现。 这样, 本发明不限制于任何特定的硬件和 软件结合。
以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于 本领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精 神和原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明 的保护范围之内。

Claims

权利要求书
1.一种无线资源映射方法, 无线通信系统通过外部置换和内部置换将 子载波映射到资源单元, 其特征在于, 所述外部置换包括:
以 N1个物理资源单元为单位对 n个物理资源单元进行一次置换操作, 从所述一次置换操作得到的 n个物理资源单元中顺序选择 nl X N1个物理资 源单元, 再对剩余的 n - nl x Nl个物理资源单元以 N2个物理资源单元为 单位进行二次置换操作, 其中, n、 M、 N2均为大于或等于 1 的整数, 且 N1不等于 N2 , nl为大于或等于 0的整数。
2.根据权利要求 1 所述的方法, 其特征在于, 在所述外部置换后, 所 述方法还包括: 将外部置换操作后的所述 n个物理资源单元映射到频率分 区。
3.根据权利要求 2 所述的方法, 其特征在于, 在映射到所述频率分区 后, 所述方法还包括:
将映射到所述频率分区的所述物理资源单元通过扇区特定置换和 /或直 接映射分为集中式资源组和 /或分布式资源组。
4.根据权利要求 3所述的方法, 其特征在于 , 所述内部置换包括: 将所述分布式资源组中的资源单元置换为逻辑分布式资源单元, 将所 述集中式资源组中的资源单元直接映射为逻辑集中式资源单元。
5.根据权利要求 1所述的方法, 其特征在于, 对剩余的 n _ nl x Nl个 物理资源单元以 N2个物理资源单元为单位进行二次置换操作之前, 将 n - nl χ ΝΙ个物理资源单元映射为原顺序或不映射为原顺序。
6.根据权利要求 2 所述的方法, 其特征在于, 将外部置换操作后的所 述 n个物理资源单元映射到频率分区包括: 根据资源配置将所述 n个物理 资源单元映射到频率分区。
7.根据权利要求 6所述的方法, 其特征在于, 所述资源配置包括以下 之一或其组合: 多载波信息、 所述物理资源单元数目 n和 /或系统带宽、 频 率分区信息。
8.根据权利要求 7所述的方法, 其特征在于, 所述多载波信息用于指 示如下信息至少之一: 相邻载波间的保护频带组成的物理资源单元的数目、 大小、 位置。
9.根据权利要求 7所述的方法, 其特征在于, 所述频率分区信息包括 以下之一或其组合: 频率分区数目、 频率分区中分布式资源组的大小、 频 率分区中集中式资源组的大小、 N1或者 N2或者 N1及 N2。
10.根据权利要求 9所述的方法, 所述根据资源配置将所述 n个物理资 源单元映射到频率分区, 包括: 根据所述频率分区信息, 对于所述 n个物 理资源单元, 首先以 max ( Nl, N2 )个物理资源单元为单位进行置换并配 置各频率分区, 再以 min ( Nl , N2 )个物理资源单元为单位进行置换并配 置各频率分区。
11.根据权利要求 2所述的方法, 其特征在于, 所述方法还包括: 所述 n个物理资源单元包括相邻载波间的保护频带组成的物理资源单元,进行所 述外部置换时, 对所述相邻载波间的保护频带组成的物理资源单元进行直 接映射, 并在映射到所述频率分区时, 将所述相邻载波间保护频带组成的 物理资源单元直接映射到最后一个包含逻辑资源组的频率分区中的逻辑集 中式资源单元。
12.根据权利要求 1至 11中任一项所述的方法, 其特征在于, N1>N2。
13.根据权利要求 1至 11中任一项所述的方法, 其特征在于, 所述外部 置换采用下列之一或其组合: 行列置换、 圓置换映射、 均勾抽取置换、 特 定序列置换或随机置换。
14.根据权利要求 1至 11中任一项所述的方法, 其特征在于, 所述内部 置换釆用行列置换; 或者, 所述内部置换根据系统带宽或者需要置换的序 列长度决定釆用下列之一或其组合: 行列置换、 圆映射置换、 特定序列置 换或随机置换。
15.—种无线资源映射方法, 无线通信系统通过外部置换和内部置换将 子载波映射到资源单元, 其特征在于, 所述外部置换包括:
以 N1个物理资源单元为单位对 n个物理资源单元中的 nl个集中式物 理资源单元进行直接映射,以 N2个物理资源单元为单位对剩余的 n _ nl个 物理资源单元进行置换操作, 并将经过直接映射和置换后的所述 n个物理 资源单元映射到频率分区;
其中, 经过直接映射的所述 nl个物理资源单元映射到的所述频率分区 中作为集中式资源单元。
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