CN106358297B - Service transmission method and device based on configurable structural frame, network element equipment and terminal - Google Patents

Service transmission method and device based on configurable structural frame, network element equipment and terminal Download PDF

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Publication number
CN106358297B
CN106358297B CN201510413347.3A CN201510413347A CN106358297B CN 106358297 B CN106358297 B CN 106358297B CN 201510413347 A CN201510413347 A CN 201510413347A CN 106358297 B CN106358297 B CN 106358297B
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transmission
unit
duration
slot
slots
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CN106358297A (en
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孙奇
韩双锋
潘成康
易芝玲
潘振岗
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China Mobile Communications Group Co Ltd
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China Mobile Communications Group Co Ltd
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Priority to PCT/CN2016/085845 priority patent/WO2017008609A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention discloses a service transmission method and a device based on a configurable structural frame, network element equipment and a terminal, wherein the service transmission method comprises the following steps: after receiving a service request of a request party, a service party determines the format of a transmission frame for the request service according to the service type of the request service and informs the request party of the determined format of the transmission frame; the transmission frame comprises a plurality of subframes, one subframe comprises one or more transmission slots, and one transmission slot comprises one or more unit slots; the unit time slot is the minimum time unit in the transmission frame, one unit time slot contains one or more data symbols, and each unit time slot has the same fixed duration. The pilot frequency patterns of unit time slots in the transmission frames of each format are different; the pilot patterns of the unit time slots contained in the unit time slots are adjusted according to the length of the transmission time slots, and the pilot patterns of the unit time slots contained in one transmission time slot are the same or different.

Description

Service transmission method and device based on configurable structural frame, network element equipment and terminal
Technical Field
The present invention relates to a service transmission technology in which a structural frame is dynamically configurable, and in particular, to a service transmission method and apparatus, a network element device, and a terminal based on a configurable structural frame.
Background
At present, a frame structure in a Long Term Evolution (LTE) system is fixed, a1 frame is 10ms Long and includes 10 subframes, each subframe is 1ms Long, and one subframe includes 14 OFDM symbols under a normal CP length. In the extended CP case, one sub-frame contains 12 OFDM symbols (subcarrier spacing of 15KHz) or 6 OFDM symbols (subcarrier spacing of 7.5 KHz). Where the 7.5KHz subcarrier spacing is used for MBSFN transmission only. Based on the fixed frame structure configuration, the pilot configuration in the LTE system is also fixed and cannot be dynamically changed according to the channel state information and the system transmission rate requirement. With the prevalence of mobile Internet, new business and new applications such as 5G communication, person-to-person communication, and Things communication (IoT) will make communication devices, businesses and applications further diversified: from an extremely small data packet with little information, such as alarm information sent by Machine Type Communication (MTC), to large information transmission with a large rate and a long time, such as ultra high definition video and Virtual Reality transmission (Virtual Reality); from extremely static electricity meter access terminals to access equipment moving at ultra high speed on a high-speed rail; from meter reading equipment which is extremely insensitive to time delay to touch communication equipment which is extremely sensitive to time delay and industrial control; from chat information with low reliability requirements to intelligent traffic information with extremely sensitive reliability requirements. The current frame structure design and pilot design schemes are obtained in a compromise mode according to the requirements of various services, such as time delay, transmission rate and the mobile state requirements of users. The current communication mode cannot flexibly adapt to various service requirements and cannot meet some extreme requirements of 5G. For example, in the current LTE system, the fixed transmission Time length (TTI) of 1ms results in that some requirements of very low latency services cannot be met and resource waste is caused for transmission of an extra-small packet occurring in the internet of things system.
Disclosure of Invention
In order to solve the above technical problem, embodiments of the present invention provide a service transmission method and apparatus, a network element device, and a terminal based on a configurable structural frame.
The technical scheme of the invention is realized as follows:
a service transmission method based on configurable structure frame includes:
after receiving a service request of a request party, a service party determines the format of a transmission frame for the request service according to the service type of the request service and informs the request party of the determined format of the transmission frame;
the transmission frame comprises a plurality of subframes, one subframe comprises one or more transmission slots, and one transmission slot comprises one or more unit slots; the unit time slot is the minimum time unit in the transmission frame, one unit time slot contains one or more data symbols, and each unit time slot has the same fixed duration.
Preferably, the transmission timeslot is a minimum time unit for data transmission in the transmission frame.
Preferably, the transmission time slot is dynamically composed of a variable number of unit time slots; the duration of the transmission time slot is the product of the number of unit time slots contained in the transmission time slot and the fixed duration of the unit time slot; the duration of a transmission slot is less than or equal to the duration of the subframe in which the transmission slot is located.
Preferably, each subframe in the transmission frame has a fixed duration, and each subframe has a certain number of unit slots therein, and the number of unit slots in a subframe is the quotient of the duration of the corresponding subframe divided by the duration of the unit slot; the sum of the durations of all transmission slots within a subframe is less than or equal to the duration of the subframe.
Preferably, the pilot pattern of the unit slot in the transmission frame of each format is different; the pilot patterns of the unit time slots contained in the unit time slots are adjusted according to the length of the transmission time slots, and the pilot patterns of the unit time slots contained in one transmission time slot are the same or different.
Preferably, when the duration of the transmission time slot in the transmission frame is greater than a first set threshold or the signal-to-noise ratio exceeds a second set threshold, the pilot pattern of the unit time slot adopts a pilot pattern with the density lower than a third set threshold;
and when the transmission time slot duration in the transmission frame is less than a fourth set threshold and the signal-to-noise ratio is lower than a fifth set threshold, adopting a pilot pattern with the density greater than a sixth set threshold as the pilot pattern of the unit time slot.
Preferably, when the duration of the transmission time slot in the transmission frame does not exceed a first threshold, selecting a corresponding number of pilot frequencies for the transmission time slot according to the signal-to-noise ratio of the transmission time slot, wherein the lower the signal-to-noise ratio, the more the number of pilot frequencies in the transmission time slot;
when the duration of a transmission time slot in the transmission frame reaches a first threshold, the transmission time slot has a determined pilot frequency density; and after the duration time of the transmission time slot in the transmission frame exceeds a first threshold, the pilot frequency density of the transmission time slot is kept unchanged.
Preferably, the first threshold is a duration corresponding to a maximum number of consecutive unit time slots when the channel is approximately flat-fading; wherein the larger the Doppler shift, the smaller the first threshold.
Preferably, the format of the transmission frame notified to the requester by the service side includes a transmission slot position of the transmission frame and pilot configuration information of the transmission slot.
A service receiving method based on a configurable structure frame comprises the following steps:
after a request party sends a service request to a service party, receiving a format of a transmission frame which is sent by the service party and determined for the requested service, and analyzing service data received from the service party by using the format of the transmission frame;
the transmission frame comprises a plurality of subframes, one subframe comprises one or more transmission slots, and one transmission slot comprises one or more unit slots; the unit time slot is the minimum time unit in the transmission frame, one unit time slot contains one or more data symbols, and each unit time slot has the same fixed duration.
Preferably, the transmission timeslot is a minimum time unit for data transmission in the transmission frame.
Preferably, the transmission time slot is dynamically composed of a variable number of unit time slots; the duration of the transmission time slot is the product of the number of unit time slots contained in the transmission time slot and the fixed duration of the unit time slot; the duration of a transmission slot is less than or equal to the duration of the subframe in which the transmission slot is located.
Preferably, each subframe in the transmission frame has a fixed duration, and each subframe has a certain number of unit slots therein, and the number of unit slots in a subframe is the quotient of the duration of the corresponding subframe divided by the duration of the unit slot; the sum of the durations of all transmission slots within a subframe is less than or equal to the duration of the subframe.
Preferably, the method further comprises:
the requesting party receives pilot frequency pattern information of a unit time slot in a transmission frame sent by the service party; wherein, a plurality of unit slot pilot patterns contained in one transmission slot are the same or different.
A traffic transmission apparatus based on configurable structural frame, comprising: receiving unit, determining unit and notifying unit, wherein:
the receiving unit is used for triggering the determining unit after receiving the service request of the requesting party;
a determining unit, configured to determine a format of a transmission frame for a requested service according to a service type of the requested service; wherein the transmission frame comprises a plurality of subframes, one subframe comprises one or more transmission slots, and one transmission slot comprises one or more unit slots; the unit time slot is the minimum time unit in the transmission frame, one unit time slot comprises one or more data symbols, and each unit time slot has the same fixed duration;
a notifying unit configured to notify the requester of the determined format of the transmission frame.
Preferably, the transmission timeslot is a minimum time unit for data transmission in the transmission frame.
Preferably, the transmission time slot is dynamically composed of a variable number of unit time slots; the duration of the transmission time slot is the product of the number of unit time slots contained in the transmission time slot and the fixed duration of the unit time slot; the duration of a transmission slot is less than or equal to the duration of the subframe in which the transmission slot is located.
Preferably, each subframe in the transmission frame has a fixed duration, and each subframe has a certain number of unit slots therein, and the number of unit slots in a subframe is the quotient of the duration of the corresponding subframe divided by the duration of the unit slot; the sum of the durations of all transmission slots within a subframe is less than or equal to the duration of the subframe.
Preferably, the determining unit is further configured to determine that pilot patterns of unit slots in transmission frames of each format are different; the pilot patterns of the unit time slots contained in the unit time slots are adjusted according to the length of the transmission time slots, and the pilot patterns of the unit time slots contained in one transmission time slot are the same or different.
Preferably, the determining unit is further configured to:
when the duration of a transmission time slot in the transmission frame is greater than a first set threshold or the signal-to-noise ratio exceeds a second set threshold, adopting a pilot pattern with the density lower than a third set threshold as a pilot pattern of a unit time slot;
and when the transmission time slot duration in the transmission frame is less than a fourth set threshold and the signal-to-noise ratio is lower than a fifth set threshold, adopting a pilot pattern with the density greater than a sixth set threshold as the pilot pattern of the unit time slot.
Preferably, the determining unit is further configured to:
when the duration of the transmission time slot in the transmission frame does not exceed a first threshold, selecting a corresponding number of pilot frequencies for the transmission time slot according to the signal-to-noise ratio of the transmission time slot, wherein the lower the signal-to-noise ratio, the more the number of the pilot frequencies in the transmission time slot;
when the duration of a transmission time slot in the transmission frame reaches a first threshold, the transmission time slot has a determined pilot density; and after the duration time of the transmission time slot in the transmission frame exceeds a first threshold, the pilot frequency density of the transmission time slot is kept unchanged.
Preferably, the first threshold is a duration corresponding to a maximum number of consecutive unit time slots when the channel is approximately flat-fading; wherein the larger the Doppler shift, the smaller the first threshold.
Preferably, the format of the transmission frame notified to the requester by the service side includes a transmission slot position of the transmission frame and pilot configuration information of the transmission slot.
A service receiving apparatus based on configurable frame, the service receiving apparatus comprising: a transmitting unit, a receiving unit and an analyzing unit, wherein:
a sending unit, configured to send a service request to a service party;
a receiving unit, configured to receive a format of a transmission frame determined for a requested service, sent by the service party;
the analysis unit is used for analyzing the service data received from the service party by using the format of the transmission frame;
wherein the transmission frame comprises a plurality of subframes, one subframe comprises one or more transmission slots, and one transmission slot comprises one or more unit slots; the unit time slot is the minimum time unit in the transmission frame, one unit time slot contains one or more data symbols, and each unit time slot has the same fixed duration.
Preferably, the transmission timeslot is a minimum time unit for data transmission in the transmission frame.
Preferably, the transmission time slot is dynamically composed of a variable number of unit time slots; the duration of the transmission time slot is the product of the number of unit time slots contained in the transmission time slot and the fixed duration of the unit time slot; the duration of a transmission slot is less than or equal to the duration of the subframe in which the transmission slot is located.
Preferably, each subframe in the transmission frame has a fixed duration, and each subframe has a certain number of unit slots therein, and the number of unit slots in a subframe is the quotient of the duration of the corresponding subframe divided by the duration of the unit slot; the sum of the durations of all transmission slots within a subframe is less than or equal to the duration of the subframe.
Preferably, the receiving unit is further configured to:
receiving pilot frequency pattern information of a unit time slot in a transmission frame sent by the service party; wherein, a plurality of unit slot pilot patterns contained in one transmission slot are the same or different.
A network element device includes the foregoing service transmission apparatus based on the configurable structural frame.
A terminal, comprising the service receiving apparatus based on the configurable structural frame.
According to the technical scheme of the embodiment of the invention, a service party determines a transmission frame format for the service requested by a request party according to the service type requested by a service request party. The transmission frame of the embodiment of the invention comprises a plurality of subframes, wherein one subframe comprises one or more transmission time slots, and one transmission time slot comprises one or more unit time slots; the unit time slot is the minimum time unit in the transmission frame, one unit time slot contains one or more data symbols, and each unit time slot has the same fixed duration. The dynamic frame structure of the embodiment of the invention can realize a frame structure which can simultaneously support various TTI lengths in a transmission system, allocate different TTI lengths according to different service requirements, for example, short TTI can be allocated to low-delay service, so as to meet the delay requirement, long TTI can be allocated to high-speed and delay-insensitive service, and the pilot frequency overhead is reduced. In addition, the embodiment of the invention and the dynamic pilot frequency configuration corresponding to the provided configurable frame structure can effectively ensure the reliability and effectiveness of system transmission, greatly improve the flexibility of service transmission and improve the service transmission efficiency.
Drawings
Fig. 1 is a flowchart of a service transmission method based on a configurable structural frame according to an embodiment of the present invention;
fig. 2 is a flowchart of a service receiving method based on a configurable frame according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a structure of a transmission frame according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a pilot pattern in a transmission timeslot of service 1 according to a first embodiment of the present invention;
fig. 5 is a schematic diagram of a pilot pattern in a transmission timeslot of service 2 according to a first embodiment of the present invention;
fig. 6 is a schematic diagram of a pilot pattern in a transmission timeslot of service 1 according to a second embodiment of the present invention;
fig. 7 is a schematic diagram of a pilot pattern in a transmission timeslot of service 2 according to a second embodiment of the present invention;
fig. 8 is a schematic structural diagram of a service transmission apparatus based on configurable structural frame according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a service receiving apparatus based on a configurable frame according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings by way of examples.
It should be noted that, if not conflicted, the embodiments of the invention and the features of the embodiments can be combined with each other and are within the scope of protection of the invention. Additionally, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Fig. 1 is a flowchart of a service transmission method based on a configurable structural frame according to an embodiment of the present invention, and as shown in fig. 1, the service transmission method based on the configurable structural frame according to the embodiment of the present invention includes the following steps:
step 101, after receiving a service request from a requesting party, a service party determines a format of a transmission frame for a requested service according to a service type of the requested service.
In the embodiment of the invention, a network side network element of a service party such as a base station and the like can determine a proper transmission frame format for the service according to the service type of the service requested by a service requesting party such as UE (user equipment), so that the determined transmission frame format is more suitable for the transmission of the service, and the resource utilization rate and the communication efficiency of the whole system are maximized under the condition of ensuring the service transmission quality.
In the embodiment of the invention, the transmission frame comprises a plurality of subframes, one subframe comprises one or more transmission time slots, and one transmission time slot comprises one or more unit time slots; the unit time slot is the minimum time unit in the transmission frame, one unit time slot contains one or more data symbols, and each unit time slot has the same fixed duration. That is to say, the structure of the transmission frame in the embodiment of the present invention is flexible and adjustable, and the network side device sets the transmission frame format for the corresponding service according to the service characteristics.
In the embodiment of the present invention, a transmission timeslot in a transmission frame is a minimum time unit for data transmission in the transmission frame. The transmission time slot is dynamically composed of a variable number of unit time slots; the duration of the transmission time slot is the product of the number of unit time slots contained in the transmission time slot and the fixed duration of the unit time slot; the duration of a transmission slot is less than or equal to the duration of the subframe in which the transmission slot is located. Each subframe in the transmission frame has a fixed duration, a determined number of unit slots are provided in each subframe, and the number of unit slots in a subframe is the quotient of the duration of the corresponding subframe divided by the duration of the unit slot; the sum of the durations of all transmission slots within a subframe is less than or equal to the duration of the subframe.
In order to facilitate the receiving end to carry out channel estimation and the like when the transmission frame structures are different, in the embodiment of the invention, the pilot frequency patterns of unit time slots in the transmission frames of each format are different; the pilot patterns of the unit time slots contained in the unit time slots are adjusted according to the length of the transmission time slots, and the pilot patterns of the unit time slots contained in one transmission time slot are the same or different. Specifically, when the duration of a transmission time slot in the transmission frame is greater than a first set threshold or the signal-to-noise ratio exceeds a second set threshold, the pilot pattern of the unit time slot adopts a pilot pattern with the density lower than a third set threshold; and when the duration of the transmission time slot in the transmission frame is less than a fourth set threshold and the signal-to-noise ratio is lower than a fifth set threshold, adopting the pilot pattern with the density greater than a sixth set threshold as the pilot pattern of the unit time slot.
When the duration of the transmission time slot in the transmission frame does not exceed a first threshold, selecting a corresponding number of pilot frequencies for the transmission time slot according to the signal-to-noise ratio of the transmission time slot, wherein the lower the signal-to-noise ratio, the more the number of the pilot frequencies in the transmission time slot; when the duration of a transmission time slot in the transmission frame reaches a first threshold, the transmission time slot has a determined pilot density; and after the duration time of the transmission time slot in the transmission frame exceeds a first threshold, the pilot frequency density of the transmission time slot is kept unchanged.
In the embodiment of the invention, the first threshold is the duration corresponding to the maximum continuous unit time slot number when the channel is approximately flat fading; wherein the larger the Doppler shift, the smaller the first threshold.
Step 102, notifying the requesting party of the determined format of the transmission frame.
In the embodiment of the present invention, after the service party determines the format of the transmission frame for the request party, the determined format of the transmission frame needs to be notified to the request party, so that the request party can conveniently perform service encapsulation according to the received format of the transmission frame, thereby performing service transmission in the received format of the transmission frame.
In the embodiment of the present invention, the format of the transmission frame notified to the requester by the service side includes a transmission time slot position of the transmission frame and pilot configuration information of the transmission time slot. In the embodiment of the present invention, the position of the transmission timeslot in the transmission frame and the pilot configuration information need to be notified to the service requester, so that the receiver can perform channel estimation according to the pilot configuration information when the requester transmits the service data in the received transmission frame format.
In the embodiment of the present invention, the service party may include a base station, a base station controller, a mobile management unit, and the like. The requesting party may be a mobile terminal, a game console, a tablet computer, a personal digital assistant, and the like.
Fig. 2 is a flowchart of a service receiving method based on a configurable structural frame according to an embodiment of the present invention, and as shown in fig. 2, the service transmitting method based on the configurable structural frame according to the embodiment of the present invention includes the following steps:
step 201, after a request party sends a service request to a service party, a format of a transmission frame determined for the requested service sent by the service party is received.
In the embodiment of the invention, the transmission frame comprises a plurality of subframes, one subframe comprises one or more transmission time slots, and one transmission time slot comprises one or more unit time slots; the unit time slot is the minimum time unit in the transmission frame, one unit time slot contains one or more data symbols, and each unit time slot has the same fixed duration.
The transmission time slot is the minimum time unit for data transmission in the transmission frame.
The transmission time slot is dynamically composed of a variable number of unit time slots; the duration of the transmission time slot is the product of the number of unit time slots contained in the transmission time slot and the fixed duration of the unit time slot; the duration of a transmission slot is less than or equal to the duration of the subframe in which the transmission slot is located.
Each subframe in the transmission frame has a fixed duration, a determined number of unit slots are provided in each subframe, and the number of unit slots in a subframe is the quotient of the duration of the corresponding subframe divided by the duration of the unit slot; the sum of the durations of all transmission slots within a subframe is less than or equal to the duration of the subframe.
The specific structure of the transmission frame is shown in fig. 3.
Step 202, parsing the service data received from the service party by using the format of the transmission frame.
The service data sent by the service party to the requester is analyzed by the requester by using the structure of the transmission frame of the request service notified by the service party, and specifically, the service data is directly analyzed according to the structure information of the received service frame.
In the embodiment of the present invention, the requesting party further needs to receive pilot pattern information of a unit time slot in a transmission frame sent by the service party; in this way, pilot pattern utilization can be performed according to the pilot pattern of the unit slot, in which a plurality of unit slot pilot patterns included in one transmission slot are the same or different.
In the embodiment of the present invention, the service party may include a base station, a base station controller, a mobile management unit, and the like. The requesting party may be a mobile terminal, a game console, a tablet computer, a personal digital assistant, and the like.
The technical solution of the embodiments of the present invention is further described below by specific examples.
The embodiment of the invention provides a service transmission method based on a configurable structure frame aiming at the requirements of different time delays, transmission data sizes and the like of diversified services of a 5G communication system, adopts a dynamic frame structure, can dynamically allocate TTIs with different lengths and corresponding pilot frequency configurations according to different service types of different users, can effectively configure wireless resources to serve the users, and improves the system efficiency.
Fig. 3 is a schematic structural diagram of a transmission frame according to an embodiment of the present invention, and as shown in fig. 3, the configurable frame structure according to an embodiment of the present invention has the following features:
1) one frame is composed of a plurality of subframes, one subframe is composed of one or more transmission slots, and one transmission slot is composed of one or more unit slots; wherein,
a unit slot is the smallest time unit distinguishable in a frame structure, and one unit slot contains one or more data symbols. Each unit time slot has the same fixed duration;
2) the transmission time slot is the minimum time unit allocated to the user for data transmission in the frame structure, i.e. when the transmission frame is allocated to the user for data transmission, at least one transmission time slot is allocated to the user. A transmission slot consists of a variable number of unit slots dynamically with a duration that is the number of unit slots involved multiplied by the duration of the unit slots. The specific duration of the transmission slot allocated to a user (i.e., the number of unit slots involved) is determined by the latency requirements of the user traffic and the data load. The duration of a transmission slot may not exceed the duration of the subframe in which it is located.
3) Each subframe has a fixed duration. Each subframe has a certain number of unit slots, the number of which is the duration of the corresponding subframe divided by the duration of the unit slot; the sum of the durations of all transmission slots within a subframe does not exceed the duration of the subframe.
Corresponding to the above frame structure, the embodiment of the present invention sets up a corresponding dynamic pilot configuration method for different transmission frame formats, and is characterized in that: when the sending end distributes the transmission time slot for the user, the pattern of the pilot frequency in the transmission time slot is dynamically configured according to the length of the transmission time slot (the number of the unit time slots), the Doppler frequency shift of the channel and other channel characteristics and the signal-to-noise ratio.
Specifically, a plurality of pilot patterns are designed for each unit time slot, and the pilot patterns of the unit time slots included in the unit time slots are adjusted according to the length of the transmission time slot, so that the pilot patterns of the whole transmission time slot are adjusted, and the pilot patterns of a plurality of unit time slots included in one transmission time slot may be different.
The pilot frequency dynamic configuration criterion of the embodiment of the invention is as follows:
a) when the transmission time slot duration is longer or the signal-to-noise ratio is higher, a sparser density pilot pattern is used.
b) When the transmission time slot duration is short and the signal-to-noise ratio is low, a denser pilot pattern is used.
In particular, when the duration of the transmission time slot does not exceed the threshold a, a corresponding number of pilots may be selected in one transmission time slot according to the signal-to-noise ratio, and the lower the signal-to-noise ratio, the greater the number of pilots in one transmission time slot. The transmission slot has a certain pilot density when the transmission slot duration reaches a threshold a. When the duration of the transmission time slot exceeds the threshold A, the pilot density of the transmission time slot is kept unchanged. The threshold a is the duration corresponding to the maximum number of consecutive unit time slots when the channel is approximately flat fading, and is affected by the channel doppler shift. The larger the doppler shift, the smaller the threshold a.
In an embodiment of the invention, the base station indicates the position of the allocated transmission time slot to the user receiver, and simultaneously indicates the pilot frequency configuration of the allocated transmission time slot.
Example one
One frame is 10ms long and comprises 10 subframes, each subframe is 1ms long, and each subframe comprises 6 unit time slots; each unit slot contains 2 OFDM symbols, each OFDM symbol being 66.7us in duration; the subcarrier interval of the OFDM system is 15 KHz;
the base station divides the users in the system into a plurality of user sets according to the service characteristics of the users, and the users in each set correspond to one transmission service type. Considering that the service type 1 and the service type 2 are transmitted simultaneously in the system, the service type 1 is an ultra-low delay service such as intelligent industrial control, virtual reality and the like, and the service type 2 is a high-speed downloading service insensitive to delay such as ultra-high-definition video and the like. 2 unit time slots are distributed for the service type 1 to form a transmission time slot, and 6 unit time slots are distributed for the service type 2 to form a transmission time slot; service 1 and service 2 may be transmitted in a frequency division manner on one subframe, or may be transmitted in a time division manner on two different subframes.
Considering that the communication system is a 2GHz system, the moving speed of the user is 10Km/h, and the value of the coherence time threshold A is about 24 ms. The transmission time of the service 1 and the transmission time of the service 2 are both smaller than the threshold A. According to the signal-to-noise ratio, the number of the time domain pilots of the service 1 and the service 2 in each transmission time slot is selected to be 2. The specific pilot pattern is shown in fig. 4 and 5, wherein gray squares indicate the carrier pilot symbols. Since traffic 1 is relatively delay sensitive, its pilot symbol (R)0) The configured density is more dense, so that the receiving side can conveniently carry out channel estimation according to the pilot frequency symbols, the transmission service is ensured to be accurately demodulated by the receiving side, and the signal-to-noise ratio of the transmission service is ensured. In the transmission frame allocated for the service 1, 2 unit time slots form one transmission time slot, so that the length of the transmission time slot is shorter, and the data demodulation is facilitated on the receiving side. While the service 2 is not particularly sensitive to the time delay, at this time, the utilization rate of the data transmission frame and the high efficiency of the service transmission need to be ensured, so that the transmission frame allocated for the service 2 uses 6 unit time slots as one transmission time slot, and the pilot symbols in the transmission time slot are sparse to ensure the utilization rate of the transmission frame.
The base station respectively informs the number of unit time slots and pilot frequency patterns contained in one transmission time slot of each of the service 1 user and the service 2 user, and the initial unit time slot position and frequency resource condition of transmission resources respectively allocated to the two users through a downlink control channel. Preferably, the method for informing the starting time slot position includes that the base station numbers all unit time slots in one frame, predetermines a pilot pattern of each unit time slot, and numbers each pilot pattern type. The base station informs the initial unit time slot position number of the transmission resource distributed by each of the two users, the unit time slot number and the pilot frequency pattern type number contained in each transmission time slot through the downlink control information.
And each user acquires data and pilot frequency information on corresponding transmission resources according to the received indication information from the base station. And performing channel estimation by using the pilot frequency information, and completing data demodulation.
Example two
Considering a frame structure supporting a large bandwidth, the system bandwidth may be 100/125/175/250/300/500MHz, the OFDM subcarrier spacing is 240KHz, and each OFDM symbol is 4.17us in length. The Cyclic Prefix (CP) length is 0.79 us. The 1 unit slot in the system is defined to contain 2 OFDM symbols, which is about 50us in length. A transmission slot may be composed of a variable number of unit slot bundles. The length of 1 sub-frame is 1ms, each frame is composed of 10 sub-frames, and the time length is 10 ms.
The base station divides the users in the system into a plurality of user sets according to the service characteristics of the users, and the users in each set correspond to one transmission service type. Considering that the service type 1 and the service type 2 are transmitted simultaneously in the system, the service type 1 is an ultra-low delay service, such as intelligent industrial control, virtual reality and the like, and the service type 2 is a high-rate downloading service insensitive to delay, such as ultra-high-definition video and the like. 2 unit time slots are distributed for the service type 1 to form a transmission time slot, and 20 unit time slots are distributed for the service type 2 to form a transmission time slot. That is, one transmission slot of service 1 and service 2 contains 20 OFDM symbols and 200 OFDM symbols, respectively. Service 1 and service 2 may be transmitted in a frequency division manner on one subframe, or may be transmitted in a time division manner on two different subframes.
Considering that the communication system is a 4GHz system, the moving speed of the user transmitting the service type 1 is 50Km/h, and the value of the coherence time threshold A1 is about 2.28 ms. The moving speed of the user of the transmission service type is 10Km/h, and the value of the coherence time threshold A2 is 11 ms. As shown in fig. 6 and 7, the transmission times of the service 1 and the service 2 are both less than the thresholds a1 and a 2. The number of time domain pilots for service 1 and service 2 in each transmission slot is selected to be 4 and 10, respectively, according to the snr. That is, a time domain pilot is inserted every 5 OFDM symbols on the transmission slot of service 1, and 1 time domain pilot is inserted every 20 OFDM symbols on the transmission slot of service 2.
The base station respectively informs the number of unit time slots and pilot frequency patterns contained in one transmission time slot of each of the service 1 user and the service 2 user, and the initial unit time slot position and frequency resource condition of transmission resources respectively allocated to the two users through a downlink control channel. Preferably, the method for informing the start time slot position includes that the base station numbers all unit time slots in one frame, predetermines the pilot pattern of each unit time slot, and numbers each pilot pattern type. The base station informs the initial unit time slot position number of the transmission resource distributed by each of the 2 users, the unit time slot number and the pilot frequency pattern type number contained in each transmission time slot through the downlink control information.
And each user acquires data and pilot frequency information on corresponding transmission resources according to the received indication information from the base station. And performing channel estimation by using the pilot frequency information, and completing data demodulation.
Fig. 8 is a schematic structural diagram of a service transmission apparatus based on a configurable structural frame according to an embodiment of the present invention, and as shown in fig. 8, the service transmission apparatus based on a configurable structural frame according to an embodiment of the present invention includes a receiving unit 80, a determining unit 81, and a notifying unit 82, where:
a receiving unit 80, configured to trigger the determining unit 81 after receiving a service request of a requester;
a determining unit 81, configured to determine a format of a transmission frame for the requested service according to the service type of the requested service; wherein the transmission frame comprises a plurality of subframes, one subframe comprises one or more transmission slots, and one transmission slot comprises one or more unit slots; the unit time slot is the minimum time unit in the transmission frame, one unit time slot comprises one or more data symbols, and each unit time slot has the same fixed duration;
a notifying unit 82 configured to notify the requester of the determined format of the transmission frame.
In this embodiment of the present invention, the transmission timeslot is a minimum time unit for performing data transmission in the transmission frame.
In the embodiment of the invention, the transmission time slot is dynamically composed of unit time slots with variable numbers; the duration of the transmission time slot is the product of the number of unit time slots contained in the transmission time slot and the fixed duration of the unit time slot; the duration of a transmission slot is less than or equal to the duration of the subframe in which the transmission slot is located.
In the embodiment of the invention, each subframe in the transmission frame has a fixed duration, each subframe has a certain number of unit time slots, and the number of the unit time slots in the subframe is the quotient of the duration of the corresponding subframe divided by the duration of the unit time slot; the sum of the durations of all transmission slots within a subframe is less than or equal to the duration of the subframe.
In this embodiment of the present invention, the determining unit 81 is further configured to determine that pilot patterns of unit timeslots in transmission frames of each format are different; the pilot patterns of the unit time slots contained in the unit time slots are adjusted according to the length of the transmission time slots, and the pilot patterns of the unit time slots contained in one transmission time slot are the same or different.
In this embodiment of the present invention, the determining unit 81 is further configured to:
when the duration of a transmission time slot in the transmission frame is greater than a first set threshold or the signal-to-noise ratio exceeds a second set threshold, adopting a pilot pattern with the density lower than a third set threshold as a pilot pattern of a unit time slot;
and when the transmission time slot duration in the transmission frame is less than a fourth set threshold and the signal-to-noise ratio is lower than a fifth set threshold, adopting a pilot pattern with the density greater than a sixth set threshold as the pilot pattern of the unit time slot.
In this embodiment of the present invention, the determining unit 81 is further configured to:
when the duration of the transmission time slot in the transmission frame does not exceed a first threshold, selecting a corresponding number of pilot frequencies for the transmission time slot according to the signal-to-noise ratio of the transmission time slot, wherein the lower the signal-to-noise ratio, the more the number of the pilot frequencies in the transmission time slot;
when the duration of a transmission time slot in the transmission frame reaches a first threshold, the transmission time slot has a determined pilot density; and after the duration time of the transmission time slot in the transmission frame exceeds a first threshold, the pilot frequency density of the transmission time slot is kept unchanged.
Preferably, the first threshold is a duration corresponding to a maximum number of consecutive unit time slots when the channel is approximately flat-fading; wherein the larger the Doppler shift, the smaller the first threshold.
In the embodiment of the present invention, the format of the transmission frame notified to the requester by the service side includes a transmission time slot position of the transmission frame and pilot configuration information of the transmission time slot.
It should be understood by those skilled in the art that the implementation functions of each unit in the service transmission apparatus based on configurable structural frame shown in fig. 8 can be understood by referring to the related description of the service transmission method based on configurable structural frame in the foregoing embodiments. The functions of each unit in the service transmission apparatus based on configurable structural frames shown in fig. 8 may be implemented by a program running on a processor, or may be implemented by specific logic circuits.
An embodiment of the present invention further describes a network element device, which includes the service transmission apparatus based on the configurable structural frame shown in fig. 8. In the embodiment of the present invention, the network element device may include a base station, a base station controller, a mobile management unit, and the like.
Fig. 9 is a schematic structural diagram of a service receiving apparatus based on a configurable structural frame according to an embodiment of the present invention, and as shown in fig. 9, the service receiving apparatus based on a configurable structural frame according to an embodiment of the present invention includes: a sending unit 90, a receiving unit 91 and an analyzing unit 92, wherein:
a sending unit 90, configured to send a service request to a service party;
a receiving unit 91, configured to receive a format of a transmission frame determined for the requested service and sent by the service party;
a parsing unit 92, configured to parse the service data received from the service party by using the format of the transmission frame;
wherein the transmission frame comprises a plurality of subframes, one subframe comprises one or more transmission slots, and one transmission slot comprises one or more unit slots; the unit time slot is the minimum time unit in the transmission frame, one unit time slot contains one or more data symbols, and each unit time slot has the same fixed duration.
In this embodiment of the present invention, the transmission timeslot is a minimum time unit for performing data transmission in the transmission frame.
In the embodiment of the invention, the transmission time slot is dynamically composed of unit time slots with variable numbers; the duration of the transmission time slot is the product of the number of unit time slots contained in the transmission time slot and the fixed duration of the unit time slot; the duration of a transmission slot is less than or equal to the duration of the subframe in which the transmission slot is located.
In the embodiment of the invention, each subframe in the transmission frame has a fixed duration, each subframe has a certain number of unit time slots, and the number of the unit time slots in the subframe is the quotient of the duration of the corresponding subframe divided by the duration of the unit time slot; the sum of the durations of all transmission slots within a subframe is less than or equal to the duration of the subframe.
In this embodiment of the present invention, the receiving unit 91 is further configured to:
receiving pilot frequency pattern information of a unit time slot in a transmission frame sent by the service party; wherein, a plurality of unit slot pilot patterns contained in one transmission slot are the same or different.
It should be understood by those skilled in the art that the implementation functions of each unit in the service transmission apparatus based on configurable structural frame shown in fig. 8 can be understood by referring to the related description of the service transmission method based on configurable structural frame in the foregoing embodiments. The functions of each unit in the service transmission apparatus based on configurable structural frames shown in fig. 8 may be implemented by a program running on a processor, or may be implemented by specific logic circuits.
An embodiment of the present invention further describes a terminal, which includes the service receiving apparatus based on the configurable structural frame shown in fig. 9. The terminal can comprise a mobile phone, a game machine, a tablet computer, a personal digital assistant and other terminal equipment.
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 (26)

1. A service transmission method based on configurable structural frame, the service transmission method comprising:
after receiving a service request of a request party, a service party determines the format of a transmission frame for the request service according to the service type of the request service and informs the request party of the determined format of the transmission frame;
the transmission frame comprises a plurality of subframes, one subframe comprises one or more transmission slots, and one transmission slot comprises one or more unit slots; wherein a unit slot is the minimum time unit in the transmission frame, one unit slot contains one or more data symbols, and each unit slot has the same fixed duration;
the pilot frequency patterns of unit time slots in the transmission frames of each format are different; the pilot patterns of the unit time slots contained in the unit time slots are adjusted according to the length of the transmission time slots, and the pilot patterns of the unit time slots contained in one transmission time slot are the same or different.
2. The traffic transmission method according to claim 1, wherein the transmission timeslot is a minimum time unit for data transmission in the transmission frame.
3. The traffic transmission method according to claim 1 or 2, characterized in that the transmission slots are dynamically composed of a variable number of unit slots; the duration of the transmission time slot is the product of the number of unit time slots contained in the transmission time slot and the fixed duration of the unit time slot; the duration of a transmission slot is less than or equal to the duration of the subframe in which the transmission slot is located.
4. A traffic transmission method according to claim 3, characterized in that each subframe in the transmission frame has a fixed duration, and each subframe has a certain number of unit slots, and the number of unit slots in a subframe is the quotient of the duration of the corresponding subframe divided by the duration of the unit slot; the sum of the durations of all transmission slots within a subframe is less than or equal to the duration of the subframe.
5. The traffic transmission method according to claim 1, wherein when the duration of the transmission timeslot in the transmission frame is greater than a first set threshold or the snr exceeds a second set threshold, the pilot pattern of the unit timeslot adopts a pilot pattern with a density lower than a third set threshold;
and when the transmission time slot duration in the transmission frame is less than a fourth set threshold and the signal-to-noise ratio is lower than a fifth set threshold, adopting a pilot pattern with the density greater than a sixth set threshold as the pilot pattern of the unit time slot.
6. The traffic transmission method according to claim 1, wherein when the duration of the transmission timeslot in the transmission frame does not exceed the first threshold, a corresponding number of pilots are selected for the transmission timeslot according to the signal-to-noise ratio of the transmission timeslot, the lower the signal-to-noise ratio, the greater the number of pilots in the transmission timeslot;
when the duration of a transmission time slot in the transmission frame reaches a first threshold, the transmission time slot has a determined pilot frequency density; and after the duration time of the transmission time slot in the transmission frame exceeds a first threshold, the pilot frequency density of the transmission time slot is kept unchanged.
7. The traffic transmission method according to claim 6, wherein the first threshold is a duration corresponding to a maximum number of consecutive unit slots when the channel is approximately flat-fading; wherein the larger the Doppler shift, the smaller the first threshold.
8. The traffic transmission method according to any of claims 1, 2, 4, 5 to 7, wherein the format of the transmission frame notified to the requesting party by the traffic party includes the transmission slot position of the transmission frame and the pilot configuration information of the transmission slot.
9. A service receiving method based on a configurable frame, the service receiving method comprising:
after a request party sends a service request to a service party, receiving a format of a transmission frame which is sent by the service party and determined for the requested service, and analyzing service data received from the service party by using the format of the transmission frame;
the transmission frame comprises a plurality of subframes, one subframe comprises one or more transmission slots, and one transmission slot comprises one or more unit slots; wherein a unit slot is the minimum time unit in the transmission frame, one unit slot contains one or more data symbols, and each unit slot has the same fixed duration;
the requesting party receives pilot frequency pattern information of a unit time slot in a transmission frame sent by the service party; wherein, a plurality of unit slot pilot patterns contained in one transmission slot are the same or different.
10. The traffic receiving method according to claim 9, wherein the transmission timeslot is a minimum time unit for data transmission in the transmission frame.
11. The traffic reception method according to claim 9 or 10, characterized in that the transmission slots are dynamically composed of a variable number of unit slots; the duration of the transmission time slot is the product of the number of unit time slots contained in the transmission time slot and the fixed duration of the unit time slot; the duration of a transmission slot is less than or equal to the duration of the subframe in which the transmission slot is located.
12. The traffic receiving method according to claim 11, wherein each subframe in the transmission frame has a fixed duration, and each subframe has a certain number of unit slots therein, and the number of unit slots in a subframe is a quotient of the duration of the corresponding subframe divided by the duration of the unit slot; the sum of the durations of all transmission slots within a subframe is less than or equal to the duration of the subframe.
13. A traffic transmission apparatus based on configurable structural frame, the traffic transmission apparatus comprising: receiving unit, determining unit and notifying unit, wherein:
the receiving unit is used for triggering the determining unit after receiving the service request of the requesting party;
a determining unit, configured to determine a format of a transmission frame for a requested service according to a service type of the requested service; wherein the transmission frame comprises a plurality of subframes, one subframe comprises one or more transmission slots, and one transmission slot comprises one or more unit slots; the unit time slot is the minimum time unit in the transmission frame, one unit time slot comprises one or more data symbols, and each unit time slot has the same fixed duration;
a notifying unit configured to notify the requester of the determined format of the transmission frame;
the determining unit is further configured to determine that pilot patterns of unit timeslots in transmission frames of each format are different; the pilot patterns of the unit time slots contained in the unit time slots are adjusted according to the length of the transmission time slots, and the pilot patterns of the unit time slots contained in one transmission time slot are the same or different.
14. The traffic transmission apparatus according to claim 13, wherein the transmission timeslot is a minimum time unit for data transmission in the transmission frame.
15. Traffic transmission apparatus according to claim 13 or 14, characterized in that the transmission slots are dynamically composed of a variable number of unit slots; the duration of the transmission time slot is the product of the number of unit time slots contained in the transmission time slot and the fixed duration of the unit time slot; the duration of a transmission slot is less than or equal to the duration of the subframe in which the transmission slot is located.
16. Traffic transmission apparatus according to claim 15, wherein each sub-frame in the transmission frame has a fixed duration, and wherein there is a defined number of unit slots in each sub-frame, the number of unit slots in a sub-frame being the duration of the respective sub-frame divided by the duration of the unit slot; the sum of the durations of all transmission slots within a subframe is less than or equal to the duration of the subframe.
17. The traffic transmission apparatus according to claim 13, wherein the determining unit is further configured to:
when the duration of a transmission time slot in the transmission frame is greater than a first set threshold or the signal-to-noise ratio exceeds a second set threshold, adopting a pilot pattern with the density lower than a third set threshold as a pilot pattern of a unit time slot;
and when the transmission time slot duration in the transmission frame is less than a fourth set threshold and the signal-to-noise ratio is lower than a fifth set threshold, adopting a pilot pattern with the density greater than a sixth set threshold as the pilot pattern of the unit time slot.
18. The traffic transmission apparatus according to claim 13, wherein the determining unit is further configured to:
when the duration of the transmission time slot in the transmission frame does not exceed a first threshold, selecting a corresponding number of pilot frequencies for the transmission time slot according to the signal-to-noise ratio of the transmission time slot, wherein the lower the signal-to-noise ratio, the more the number of the pilot frequencies in the transmission time slot;
when the duration of a transmission time slot in the transmission frame reaches a first threshold, the transmission time slot has a determined pilot density; and after the duration time of the transmission time slot in the transmission frame exceeds a first threshold, the pilot frequency density of the transmission time slot is kept unchanged.
19. The traffic transmitting apparatus of claim 18, wherein the first threshold is a duration corresponding to a maximum number of consecutive unit slots when the channel is approximately flat-fading; wherein the larger the Doppler shift, the smaller the first threshold.
20. The traffic transmission apparatus according to any of claims 13, 14, 16, and 17 to 19, wherein the format of the transmission frame notified to the requesting party by the traffic party includes a transmission slot position of the transmission frame and pilot configuration information of the transmission slot.
21. A service receiving apparatus based on configurable frame, the service receiving apparatus comprising: a transmitting unit, a receiving unit and an analyzing unit, wherein:
a sending unit, configured to send a service request to a service party;
a receiving unit, configured to receive a format of a transmission frame determined for a requested service, sent by the service party;
the analysis unit is used for analyzing the service data received from the service party by using the format of the transmission frame;
wherein the transmission frame comprises a plurality of subframes, one subframe comprises one or more transmission slots, and one transmission slot comprises one or more unit slots; wherein a unit slot is the minimum time unit in the transmission frame, one unit slot contains one or more data symbols, and each unit slot has the same fixed duration;
the receiving unit is further configured to:
receiving pilot frequency pattern information of a unit time slot in a transmission frame sent by the service party; wherein, a plurality of unit slot pilot patterns contained in one transmission slot are the same or different.
22. The traffic receiving device of claim 21, wherein the transmission timeslot is a minimum time unit for data transmission in the transmission frame.
23. Traffic receiving device according to claim 21 or 22, characterized in that the transmission slots are dynamically composed of a variable number of unit slots; the duration of the transmission time slot is the product of the number of unit time slots contained in the transmission time slot and the fixed duration of the unit time slot; the duration of a transmission slot is less than or equal to the duration of the subframe in which the transmission slot is located.
24. The traffic receiving apparatus of claim 23, wherein each subframe in the transmission frame has a fixed duration, and wherein each subframe has a certain number of unit slots therein, and wherein the number of unit slots in a subframe is a quotient of the duration of the corresponding subframe divided by the duration of the unit slot; the sum of the durations of all transmission slots within a subframe is less than or equal to the duration of the subframe.
25. A network element device, characterized in that the network element device comprises the configurable structural frame based traffic transmission apparatus of any of claims 13 to 20.
26. A terminal, characterized in that the terminal comprises a service receiving apparatus based on configurable structural frame according to any of claims 21 to 24.
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