CN102752858B - A kind of random access channel resource configuration and the method and system for sending - Google Patents
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Abstract
The invention discloses a kind of configuration of random access channel resource and the method for sending, configuration RACH resource of one RACH of time domain (RACH) resource comprising N number of frequency domain, a RACH resource for frequency domain includes the M RACH resource of code domain；The total RACH resource of configuration is divided into two parts, competes RACH resource and non-competing RACH resource.The invention also discloses a kind of configuration of random access channel resource and the system for sending, RACH resource dispensing unit in system is used to configure RACH resource of the RACH resource for time domain comprising N number of frequency domain, and a RACH resource for frequency domain includes the M RACH resource of code domain.Using the method for the present invention and system, realize and reasonably configure total random access resource and competition and non-competing random access resource, send RACH to complete uplink synchronous, and reduce corresponding signaling consumption.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a method and system for resource allocation and transmission of a random access channel.
Background
LTE-LAN is a wireless communication system applied in wireless local area network, and is based on Time Division Duplex (TDD) operation mode, and its basic frame structure is shown in fig. 1. A basic frame is divided into a downlink region, an uplink region and a guard interval. The downlink region is used for transmitting downlink signals, and the uplink region is used for transmitting uplink signals.
The wireless communication system completes uplink synchronization through an uplink synchronization channel, which is also called a Random Access Channel (RACH). The uplink synchronization process comprises the following steps: the terminal sends the preamble on the uplink synchronous channel, and the base station obtains the timing advance of the signal sent by the terminal through the detection of the preamble and feeds the timing advance back to the terminal. In the time domain, the RACH generally consists of three parts, namely, a Cyclic Prefix (CP), a Preamble (Preamble), and a postfix (GT), as shown in fig. 2. The length of each section is related to the coverage. The RACH occupying more time domain resources can support larger coverage while bringing larger system overhead. In the frequency domain, the bandwidth occupied by the RACH is related to the timing accuracy, and the larger the bandwidth, the better the timing accuracy, but the larger the overhead.
Uplink synchronization generally has two modes, namely a contention mode and a non-contention mode. The contention mode refers to that the terminal randomly selects an RACH resource to transmit an RACH channel to complete uplink synchronization. This way, the situation that different terminals select the same RACH resource, that is, RACH collision occurs. The RACH collision may cause a terminal access failure, and the terminal needs to initiate the RACH again, which increases an access delay of the terminal and degrades user experience. In order to reduce collision, the RACH resources need to be increased, and at the same time, increasing the RACH resources increases the overhead of the system, and reduces the throughput of the system. The non-contention mode means that the base station allocates an RACH resource to the terminal, and the terminal transmits an RACH channel on the corresponding resource. The non-contention approach is beneficial for the terminal to access the system quickly, but the total RACH resource is not used as efficiently as the contention approach.
As described above, under the condition that the total RACH resource is constant, although increasing the non-contention RACH resource improves the experience of some terminals, the use efficiency of the total RACH resource of the system is reduced. Therefore, how to reasonably configure the total RACH resources, how to reasonably configure the contention and non-contention RACH resources, so as to transmit the RACH channel through the configured RACH resources to complete uplink synchronization, and reduce the corresponding signaling overhead is an urgent problem to be solved.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method and a system for RACH resource configuration and transmission, which achieve reasonable configuration of total RACH resources and contention and non-contention RACH resources, transmit an RACH channel to complete uplink synchronization, and reduce corresponding signaling overhead.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method of random access channel resource configuration and transmission, the method comprising:
configuring RACH resources of a time domain to comprise RACH resources of N frequency domains, and configuring RACH resources of a frequency domain to comprise RACH resources of M code domains; the base station configures total RACH resources by taking the RACH resources of a time domain as a unit; where N is fioor (F _ bw/F _ RACH), F _ bw is a carrier bandwidth, and F _ RACH is a bandwidth occupied by one frequency domain RACH resource; m is the number of RACH resources in a code domain on the RACH resources in one frequency domain, 1 ≦ M ≦ 13;
configuring the total RACH resource into two parts, wherein one part is a competitive RACH resource; the other part is non-contention RACH resources;
and sending an RACH channel through the configured RACH resource to finish uplink synchronization.
The contention RACH resource and the non-contention RACH resource adopt a time division multiplexing mode; or,
the competitive RACH resource and the non-competitive RACH resource adopt a mode of combining time division multiplexing and frequency domain multiplexing; or,
and the competitive RACH resources and the non-competitive RACH resources adopt a mode of combining time division multiplexing, frequency division multiplexing and code division multiplexing.
Wherein the F _ bw is 20MHz, or 40MHz, or 80MHz, or 160 MHz; the F _ rach is 1.2MHz, or 960 KHz.
Wherein, the number of non-contention RACH resources or contention RACH resources is fixed or not.
Wherein, the number of non-contention RACH resources, and/or the number of total RACH resources is notified to the terminal by the base station through broadcast signaling.
Wherein, the RACH resource is positioned at the end of the uplink region of the basic frame.
Wherein the non-contention RACH resource is located at the end of the RACH resource.
A system for random access channel resource configuration and transmission, the system comprising: an RACH resource configuration unit and a channel transmission unit; wherein,
the system comprises an RACH resource configuration unit, a data processing unit and a data processing unit, wherein the RACH resource configuration unit is used for configuring RACH resources of a time domain including RACH resources of N frequency domains, and RACH resources of a frequency domain including RACH resources of M code domains; the base station configures total RACH resources by taking the RACH resources of a time domain as a unit; wherein, N is floor (F _ bw/F _ RACH), F _ bw is a carrier bandwidth, and F _ RACH is a bandwidth occupied by one frequency domain RACH resource; m is the number of RACH resources in a code domain on the RACH resources in one frequency domain, 1 ≦ M ≦ 13; configuring the total RACH resource into two parts, wherein one part is a competitive RACH resource; the other part is non-contention RACH resources;
and the channel transmitting unit is used for transmitting the RACH channel through the configured RACH resource to finish uplink synchronization.
The RACH resource configuration unit is further configured to configure a time division multiplexing manner between a contention RACH resource and the non-contention RACH resource; or, a mode of combining time division multiplexing and frequency domain multiplexing is adopted between the competitive RACH resources and the non-competitive RACH resources; or, the contention RACH resource and the non-contention RACH resource adopt a combination of time division multiplexing, frequency division multiplexing, and code division multiplexing.
Wherein, the RACH resource configuration unit is further configured to configure the number of non-contention RACH resources or the number of contention RACH resources to be fixed or not fixed.
The invention configures RACH resources of a time domain to comprise RACH resources of N frequency domains, and RACH resources of a frequency domain to comprise RACH resources of M code domains; the base station configures total RACH resources by taking the RACH resources of a time domain as a unit; wherein, N is floor (F _ bw/F _ RACH), F _ bw is a carrier bandwidth, and F _ RACH is a bandwidth occupied by one frequency domain RACH resource; 1< M < 13; the total RACH resource is configured into two parts: contending for RACH resources and non-contending for RACH resources; and sending an RACH channel through the configured RACH resource to finish uplink synchronization. The invention realizes the reasonable configuration of the total RACH resources and the competitive and non-competitive RACH resources, sends the RACH channel to complete the uplink synchronization and reduces the corresponding signaling overhead.
Drawings
FIG. 1 is a diagram illustrating a basic frame structure of an LTE-LAN in the prior art;
fig. 2 is a schematic time domain structure diagram of a RACH in the prior art;
fig. 3 is a schematic diagram of a frame structure according to a sixth embodiment of the present invention;
FIG. 4 is a frame structure diagram according to a second embodiment of the present invention;
FIG. 5 is a frame structure diagram according to a third embodiment of the present invention;
FIG. 6 is a frame structure diagram according to a fourth embodiment of the present invention;
fig. 7 is a schematic diagram of a frame structure according to a fifth embodiment of the present invention.
Detailed Description
The basic idea of the invention is: the total RACH resources and the competitive and non-competitive RACH resources are reasonably configured, the RACH channel is transmitted by utilizing the reasonably configured RACH resources to complete uplink synchronization, and the corresponding signaling overhead is reduced.
A method for configuring and transmitting RACH channel resources mainly comprises the following steps:
the RACH resource of one time domain comprises RACH resources of N frequency domains, and the RACH resource of one frequency domain comprises RACH resources of M code domains. The base station configures the total RACH resources by taking the RACH resources in the time domain as a unit. The total RACH resource is configured into two parts, wherein one part is configured into the RACH resource used for competition, namely the RACH resource is the competition RACH resource; another part is configured as RACH resources for non-contention, i.e. non-contention RACH resources. Wherein, N is floor (F _ bw/F _ RACH), F _ bw is a carrier bandwidth, and F _ RACH is a bandwidth occupied by one frequency domain RACH resource; m is the number of RACH resources in the code domain on the RACH resources in one frequency domain, and 1 ≦ M ≦ 13.
And secondly, sending an RACH channel through the configured RACH resource to finish uplink synchronization.
The following is a detailed description of the first aspect:
furthermore, a time division multiplexing mode is adopted between the competitive RACH resources and the non-competitive RACH resources; or a mode of combining time division multiplexing and frequency domain multiplexing is adopted between the competitive RACH resources and the non-competitive RACH resources; or a mode of combining time division multiplexing, frequency division multiplexing and code division multiplexing is adopted between the competitive RACH resources and the non-competitive RACH resources.
Here, as can be seen from comparing the schematic diagram of the present invention with the prior art, the present invention, except that the basic frame structure of the prior art is changed, the RACH configuration of the prior art as shown in fig. 2 is only a conventional code division manner; the RACH configuration of the invention simultaneously comprises a competitive RACH resource and a non-competitive RACH resource, and a plurality of optional configuration modes are adopted between the competitive RACH resource and the non-competitive RACH resource, namely: a time division multiplexing mode is adopted between the competition RACH resources and the non-competition RACH resources; or a mode of combining time division multiplexing and frequency domain multiplexing is adopted between the competitive RACH resources and the non-competitive RACH resources; or a mode of combining time division multiplexing, frequency division multiplexing and code division multiplexing is adopted between the competitive RACH resources and the non-competitive RACH resources.
Further, the contention RACH resource, and/or the non-contention RACH resource may be 0.
Further, F _ bw is 20MHz, or 40MHz, or 80MHz, or 160 MHz; f _ rach ═ 1.2MHz, or 960 KHz.
Further, the number of non-contention RACH resources or contention RACH resources may be fixed or may not be fixed.
Further, the number of non-contention RACH resources, and/or the number of contention RACH resources, and/or the total number of RACH resources is notified to the terminal by the base station through broadcast signaling.
Further, the RACH resource is located at the end of the uplink region of the basic frame.
Further, the number of the RACH resource is determined by the end of the uplink region of the basic frame, and the number of the RACH resource is incremented from the end forward or from the end backward.
Further, the non-contention RACH resource is located at the end of the RACH resource.
In summary, the present invention provides a new RACH resource organization and configuration scheme according to the characteristics of the wireless local area network, and can transmit an RACH channel by using the configured RACH resource to complete uplink synchronization. The invention can flexibly configure the total RACH resource quantity according to the user quantity, and configure the proportion of competitive RACH resources and non-competitive RACH resources in the total RACH resources, thereby effectively reducing the access delay of the terminal and controlling the signaling overhead of the system.
The following describes the embodiments in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
as shown in fig. 3, the carrier bandwidth is 20MHz, and the system has one carrier, and the RACH resource bandwidth in one frequency domain is 1.2MHz, then floor (20/1.2) ═ 16. The number of time domain RACH resources is 2. One frequency domain RACH resource includes 1 code domain RACH resource. RACH resources are located at the tail end of an uplink region of a basic frame, and time domain resources are increased forwards.
The contention RACH resource and the non-contention RACH resource occupy a time domain RACH resource respectively, namely the contention RACH resource and the non-contention RACH resource adopt a time division multiplexing mode. The contention RACH resource uses a time domain RACH resource 0 and the non-contention RACH resource uses a time domain RACH resource 1. The non-contention RACH resource is located at the end of the RACH resource.
The number of the competitive RACH resources and the non-competitive RACH resources is not fixed, and the base station informs the configuration conditions of the competitive RACH resources and the non-competitive RACH resources through broadcast signaling. Here, it should be noted that: this example differs from the following sixth example in that: the number of the contention RACH resource and the non-contention RACH resource of the sixth embodiment is fixed.
Example two:
as shown in fig. 4, the carrier bandwidth is 20MHz, and the system has two carriers, and the RACH resource bandwidth in one frequency domain is 1.2MHz, then floor (20/1.2) ═ 16. The number of time domain RACH resources is 2. One frequency domain RACH resource includes 1 code domain RACH resource. RACH resources are located at the tail end of an uplink region of a basic frame, and time domain resources are increased forwards.
The contention RACH resource and the non-contention RACH resource occupy a time domain RACH resource respectively, namely the contention RACH resource and the non-contention RACH resource adopt a time division multiplexing mode. The contention RACH resource uses a time domain RACH resource 0 and the non-contention RACH resource uses a time domain RACH resource 1. The non-contention RACH resource is located at the end of the RACH resource.
The number of the competitive RACH resources and the non-competitive RACH resources is not fixed, and the base station informs the configuration conditions of the competitive RACH resources and the non-competitive RACH resources through broadcast signaling.
Example three:
as shown in fig. 5, the carrier bandwidth is 40MHz, and the system has one carrier, and the RACH resource bandwidth in one frequency domain is 1.2MHz, then floor (20/1.2) ═ 33. The number of time domain RACH resources is 2. One frequency domain RACH resource includes 1 code domain RACH resource. RACH resources are located at the tail end of an uplink region of a basic frame, and time domain resources are increased forwards.
The contention RACH resource and the non-contention RACH resource occupy a time domain RACH resource respectively, namely the contention RACH resource and the non-contention RACH resource adopt a time division multiplexing mode. The contention RACH resource uses a time domain RACH resource 0 and the non-contention RACH resource uses a time domain RACH resource 1. The non-contention RACH resource is located at the end of the RACH resource.
The number of the competitive RACH resources and the non-competitive RACH resources is not fixed, and the base station informs the configuration conditions of the competitive RACH resources and the non-competitive RACH resources through broadcast signaling.
Example four:
as shown in fig. 6, the carrier bandwidth is 20MHz, and the system has one carrier, and the RACH resource bandwidth in one frequency domain is 1.2MHz, then floor (20/1.2) ═ 16. The number of time domain RACH resources is 2. One frequency domain RACH resource includes 1 code domain RACH resource. RACH resources are located at the tail end of an uplink region of a basic frame, and time domain resources are increased forwards.
The non-contention RACH resource occupies a time domain RACH resource 0 and a first frequency domain RACH resource of a time domain RACH resource 1, and the contention RACH resource occupies other RACH resources, namely the contention RACH resource and the non-contention RACH resource adopt a mode of combining time division multiplexing and frequency division multiplexing. The non-contention RACH resource is located at the end of the RACH resource.
The number of the competitive RACH resources and the non-competitive RACH resources is not fixed, and the base station informs the configuration conditions of the competitive RACH resources and the non-competitive RACH resources through broadcast signaling.
Example five:
as shown in fig. 7, the carrier bandwidth is 20MHz, and the system has one carrier, and the RACH resource bandwidth in one frequency domain is 1.2MHz, then floor (20/1.2) ═ 16. The number of time domain RACH resources is 2. One frequency domain RACH resource includes 2 code domain RACH resources. RACH resources are located at the tail end of an uplink region of a basic frame, and time domain resources are increased forwards. Here, it should be noted that: as shown in fig. 7, the difference between the code domain configuration of this embodiment and the other embodiments is: in other embodiments, the code domain is allocated to either the contention RACH resource or the non-contention RACH resource; in the embodiment, part of the code domain is allocated to the contention RACH resources, and part of the code domain is allocated to the non-contention RACH resources, that is, one frequency domain RACH resource includes 2 code domain RACH resources.
The non-contention RACH resource occupies a time domain RACH resource 0, a first frequency domain RACH resource of a time domain RACH resource 1 and a first code domain resource on a second frequency domain resource, and the contention RACH resource occupies the rest RACH resources, namely the contention RACH resource and the non-contention RACH resource adopt a mode of combining time division multiplexing, frequency division multiplexing and code division multiplexing. The non-contention RACH resource is located at the end of the RACH resource.
The number of the competitive RACH resources and the non-competitive RACH resources is not fixed, and the base station informs the configuration conditions of the competitive RACH resources and the non-competitive RACH resources through broadcast signaling.
Example six:
as shown in fig. 3, the carrier bandwidth is 20MHz, and the system has one carrier, and the RACH resource bandwidth in one frequency domain is 1.2MHz, then floor (20/1.2) ═ 16. The number of time domain RACH resources is 2.
The number of the non-contention RACH resources is fixed to 1 time domain RACH resource, and is fixed at the tail of the RACH resource, and the base station informs that the number of the time domain RACH resources is 2 through a broadcast signaling. One frequency domain RACH resource includes 1 code domain RACH resource. RACH resources are located at the tail end of an uplink region of a basic frame, and time domain resources are increased forwards.
The contention RACH resource and the non-contention RACH resource occupy a time domain RACH resource respectively, namely the contention RACH resource and the non-contention RACH resource adopt a time division multiplexing mode. The contention RACH resource uses a time domain RACH resource 0 and the non-contention RACH resource uses a time domain RACH resource 1.
Here, english related to the above figures will be explained: basic Frame represents a Basic Frame; DLZone indicates a downlink zone; GP denotes a guard interval; UL Zone indicates an uplink region; DL Signal represents a downlink Signal; UL Signal indicates an uplink Signal.
A system for RACH channel resource configuration and transmission, the system comprising: RACH resource configuration unit and channel transmission unit. The RACH resource configuration unit is used for configuring RACH resources of a time domain to comprise RACH resources of N frequency domains, and the RACH resources of one frequency domain comprise RACH resources of M code domains; the base station configures total RACH resources by taking the RACH resources of a time domain as a unit; where N is fioor (F _ bw/F _ RACH), F _ bw is a carrier bandwidth, and F _ RACH is a bandwidth occupied by one frequency domain RACH resource; m is the number of RACH resources in a code domain on the RACH resources in one frequency domain, 1 ≦ M ≦ 13; configuring the total RACH resource into two parts, wherein one part is a competitive RACH resource; the other part is non-contention RACH resources. The channel transmitting unit is used for transmitting an RACH channel through the configured RACH resource to complete uplink synchronization.
Here, the RACH resource configuration unit is further configured to configure a time division multiplexing manner between the contention RACH resource and the non-contention RACH resource; or, a mode of combining time division multiplexing and frequency domain multiplexing is adopted between the competitive RACH resources and the non-competitive RACH resources; or, the contention RACH resource and the non-contention RACH resource are combined by time division multiplexing, frequency division multiplexing, and code division multiplexing.
Here, the RACH resource configuration unit is further configured to configure the number of non-contention RACH resources or the number of contention RACH resources to be fixed or not fixed.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (8)
1. A method for resource allocation and transmission of a random access channel, the method comprising:
configuring a random access channel RACH resource of a time domain to comprise RACH resources of N frequency domains, wherein the RACH resource of one frequency domain comprises RACH resources of M code domains; the base station configures total RACH resources by taking the RACH resources of a time domain as a unit; wherein, N is floor (F _ bw/F _ RACH), F _ bw is a carrier bandwidth, and F _ RACH is a bandwidth occupied by one frequency domain RACH resource; m is the number of RACH resources in a code domain on the RACH resources in one frequency domain, 1< ═ M < ═ 13;
configuring the total RACH resource into two parts, wherein one part is a competitive RACH resource; the other part is non-contention RACH resources;
sending an RACH channel through the configured RACH resource to complete uplink synchronization;
the contention RACH resource and the non-contention RACH resource adopt a time division multiplexing mode; or,
the competitive RACH resource and the non-competitive RACH resource adopt a mode of combining time division multiplexing and frequency domain multiplexing; or,
and the competitive RACH resources and the non-competitive RACH resources adopt a mode of combining time division multiplexing, frequency division multiplexing and code division multiplexing.
2. The method of claim 1, wherein the F bw is 20MHz, or 40MHz, or 80MHz, or 160 MHz; the F _ rach is 1.2MHz, or 960 KHz.
3. The method of claim 1 wherein the number of non-contending RACH resources and the number of contending RACH resources are fixed or the number of non-contending RACH resources and the number of contending RACH resources are not fixed.
4. Method according to claim 1, characterized in that the number of non-contending RACH resources, and/or the number of contending RACH resources, and/or the total number of RACH resources is signalled to the terminal by the base station via a broadcast.
5. The method of claim 1, wherein the RACH resource is located at the end of an uplink region of the basic frame.
6. The method of claim 1 wherein a non-contention RACH resource is located at the end of a RACH resource.
7. A system for random access channel resource configuration and transmission, the system comprising: an RACH resource configuration unit and a channel transmission unit; wherein,
the system comprises an RACH resource configuration unit, a data processing unit and a data processing unit, wherein the RACH resource configuration unit is used for configuring RACH resources of a time domain including RACH resources of N frequency domains, and RACH resources of a frequency domain including RACH resources of M code domains; the base station configures total RACH resources by taking the RACH resources of a time domain as a unit; wherein, N is floor (F _ bw/F _ RACH), F _ bw is a carrier bandwidth, and F _ RACH is a bandwidth occupied by one frequency domain RACH resource; m is the number of RACH resources in a code domain on the RACH resources in one frequency domain, 1< ═ M < ═ 13; configuring the total RACH resource into two parts, wherein one part is a competitive RACH resource; the other part is non-contention RACH resources;
the channel transmitting unit is used for transmitting an RACH channel through the configured RACH resource to finish uplink synchronization;
the RACH resource configuration unit is further configured to configure a time division multiplexing manner between a contention RACH resource and the non-contention RACH resource;
or, a mode of combining time division multiplexing and frequency domain multiplexing is adopted between the competitive RACH resources and the non-competitive RACH resources;
or, the contention RACH resource and the non-contention RACH resource are combined by time division multiplexing, frequency division multiplexing, and code division multiplexing.
8. The system of claim 7, wherein the RACH resource configuration unit is further configured to configure the number of non-contention RACH resources and the number of contention RACH resources to be fixed, or to configure the number of non-contention RACH resources and the number of contention RACH resources to be non-fixed.
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| WO2021092938A1 (en) | 2019-11-15 | 2021-05-20 | Oppo广东移动通信有限公司 | Random access channel resource configuration method, device, and storage medium |
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| CN1780457A (en) * | 2004-11-24 | 2006-05-31 | 北京三星通信技术研究有限公司 | Wireless channel resource allocation |
| CN1815933A (en) * | 2005-02-06 | 2006-08-09 | 北京邮电大学 | OFDMA system frequency time 2-D wire-less resource scheduling model and scheduling method |
| CN101043709A (en) * | 2006-03-22 | 2007-09-26 | 华为技术有限公司 | Method for realizing uplink wireless channel resource distribution |
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| US20110044260A1 (en) * | 2009-08-21 | 2011-02-24 | Motorola, Inc. | Acknowledgment of Uplink Transmission on Contention Based Resource in Wireless Communication System |
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| CN1780457A (en) * | 2004-11-24 | 2006-05-31 | 北京三星通信技术研究有限公司 | Wireless channel resource allocation |
| CN1815933A (en) * | 2005-02-06 | 2006-08-09 | 北京邮电大学 | OFDMA system frequency time 2-D wire-less resource scheduling model and scheduling method |
| CN101043709A (en) * | 2006-03-22 | 2007-09-26 | 华为技术有限公司 | Method for realizing uplink wireless channel resource distribution |
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