CN104581950A - Down link TTI (transmission time interval) bundling collocation method - Google Patents
Down link TTI (transmission time interval) bundling collocation method Download PDFInfo
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- CN104581950A CN104581950A CN201310486482.1A CN201310486482A CN104581950A CN 104581950 A CN104581950 A CN 104581950A CN 201310486482 A CN201310486482 A CN 201310486482A CN 104581950 A CN104581950 A CN 104581950A
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- community
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- time slot
- calling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/30—Resource management for broadcast services
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/08—Trunked mobile radio systems
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a down link TTI (transmission time interval) bundling collocation method which comprises steps as follows: as for each super large cell in a cluster system, the network side sets TTI bundling information for the cell and informs each cluster terminal accessing the cell of the information in a broadcasting manner; when a specific group calling business exists in the cell of the clustering system, a base station where the cell is located sets TTI bundling information for the specific group calling business and informs each cluster terminal executing the specific group calling business of the information through group calling control information. With adoption of the down link TTI bundling collocation method, the network coverage range of the cluster system can be effectively ensured, and meanwhile, influence on system spectral efficiency can be reduced.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to time slot binding (TTI Bundling) collocation method of a kind of down link in group system.
Background technology
At present, the down channel of group system is in group calling situation, and its feature can change the feature of broadcast or multicast into.Compare the individual calling situation of LTE, in group calling situation, the feature of Physical Downlink Shared Channel (PDSCH) changes a lot, downlink processing gain reduction.Such as: 1, downlink Multicast is for multiple UE, does not support HARQ feedback; 2, the MIMO technology for particular terminal can not be supported, can only the most basic single antenna pattern or diversity mode be used; 3, the channel condition of each user is different, in order to ensure the performance that all terminals receive, can only send out by user's requirement of most poor reception environment.Downlink can only utilize low order MCS.
Found by simulation study, because PDSCH does not support HARQ procedure for multiple UE, under the same error rate (BLER) requires, compared with the individual calling having HARQ procedure, the group calling downstream modulation thresholding height 6dB of cell edge UE.Like this, under same wireless channel environment, group calling without retransmit also need to reach to have HARQ procedure with individual calling time the same error rate time, the descending coverage of group calling will obviously diminish.
For above-mentioned covering problem, usually adopt following means to ensure the downlink reception error rate index of cell edge at present, guarantee the coverage of group system.
1, group calling descending selection low-order-modulated encoding scheme (modulation and coding scheme, MCS).
2, the high power frequency band of community is set, such as, is set to high power frequency band 1/3 of bandwidth of cell, the single call service of group-calling service and cell edge is distributed in high power frequency band, improve the covering power of group calling.In order to reduce presence of intercell interference, the high power frequency band of neighbor cell is mutually orthogonal.
Above-mentioned 1st kind of method adopts low order MCS can reduce the spectrum efficiency of system to the PDSCH of multicast.2nd kind of method is actually and reallocates to down transmitting power.Like this, more overabsorption is to the user of cell edge or group calling user for power resource, and the user power of center of housing estate is low, can lose overall throughput rate and the spectrum efficiency of community.The high power multi-band orthogonal configuration of neighbor cell, is also a kind of soft-frequency reuse, reduces the interference in high power frequency band.Soft-frequency reuse also can reduce the spectrum efficiency of system.
Visible, in the scheme of the above-mentioned solution group system group-calling service covering problem proposed at present, the problem that ubiquity spectrum efficiency is lowered.
Summary of the invention
In view of this, main purpose of the present invention is the time slot binding collocation method providing a kind of down link, and the method effectively can guarantee the network coverage of group system, can reduce the impact on system spectral efficiency simultaneously.
In order to achieve the above object, the technical scheme that the present invention proposes is:
A time slot binding collocation method for down link, is characterized in that, comprising:
For each super large community in group system, network side binds TTI bundling information for this community arranges time slot, and is informed each colony terminal of this community of access by the mode of broadcast;
When there is specific group-calling service in the community of group system, the base station at place, community is this specific group calling business setting TTI bundling information, and is informed each colony terminal carrying out this specific group-calling service by group calling control message; Described specific group-calling service is the group-calling service that preset service quality Q oS parameter meets corresponding predetermined target value.
In sum, the present invention proposes the time slot binding collocation method of down link, for the group-calling service down channel feature of group system, time slot binding configuration is carried out respectively for super large community and specific group-calling service, so, both effectively can guarantee the network coverage of group system, and overcome owing to not supporting the problem that the network coverage caused by HARQ procedure reduces, the spectrum efficiency of reduction system can be avoided again.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with specific embodiment, the present invention is described in further detail.
Consider in current LTE system to improve the covering power in cell edge or poor wireless environment, propose the concept of TTI Bundling, its general principle is: for up continuous Transmission Time Interval (transmissiontime interval, TTI) time slot binding is carried out, distribute to same UE, in these up TTI, transmission be the different redundancy versions (RV) of identical content.Like this, the successful probability of data decode can be improved, improve the up coverage of LTE.The uplink frame of eNodeB to binding feeds back the ACK/NACK of a HARQ procedure.Will reduce the ACK/NACK number of required HARQ like this, simultaneously because ascending resource carries out primary distribution, binding is applied to all uplink frame of this calling of this UE, and the expense that such ascending resource distributes also can reduce.
Can improve the These characteristics of communication quality based on TTI Bundling mechanism, core concept of the present invention is: in the descending middle introducing TTI Bundling mechanism of group system.But, owing to carrying out a little with the group system down channel carrying out point multipoint message traffic, there is diverse feature to the LTE system up channel of single-point business, cannot the TTI Bundling collocation method of LTE system be applied in group system, therefore, the present invention is by the group-calling service down channel feature for group system, corresponding time slot binding collocation method is proposed, time slot binding technology can be utilized effectively to improve communication quality on the one hand, guarantee the network coverage of group system, conventional method can be avoided again the considerable influence of system spectral efficiency simultaneously.
The downlink time slots binding collocation method of the embodiment of the present invention one, mainly comprises following content:
For each super large community in group system, network side binds (TTI bundling) information for this community arranges time slot, and informs each colony terminal of this community of access by the mode of broadcast.
When there is specific group-calling service in the community of group system, the base station at place, community is this specific group calling business setting TTI bundling information, and is informed each colony terminal carrying out this specific group-calling service by group calling control message.
Here, consider that the community that in group system, planning area is larger can exist obvious covering problem, therefore in the present embodiment, for these large communities and above-mentioned super large community, utilize TTI bundling mechanism to improve their downlink transfer quality, guarantee its descending coverage not by the impact without HARQ procedure.
Described super large community specifically can be defined as the actual area coverage of business and signal strength signal intensity the ratio of area coverage can be greater than the community of predetermined threshold value.Wherein the occurrence of threshold value can be arranged according to real network performance need by those skilled in the art.
In addition, consider that some important group-calling services have higher requirement to communication quality, in order to ensure the downlink transfer quality of this type of group-calling service, optimize the coverage of its group-calling service, need to carry out corresponding TTI bundling information configuration for this type of group-calling service, and the colony terminal related to due to a group-calling service may belong to different communities, therefore, is not configured by the above-mentioned mode configuring TTI bundling information in units of community in whole cell range.Therefore in the above-mentioned methods, propose the TTI bundling information configuration mode for specific group-calling service specially, utilize group calling control message to carry out the notice of TTI bundling information in this configuration mode, thus within the scope of all colony terminals that can comprise in group calling, realize the TTI bundling information configuration of specific group-calling service.
Preferably, in said method, network side is that super large community can adopt following two kinds of modes to realize when arranging TTI bundling information:
A kind of is directly arrange TTI bundling information by the base station at place, super large community for this community, another kind is by core net (as MME or OAM) for this super large community arranges TTI bundling information, then set TTI bundling message notice is given the base station at this place, super large community.
Preferably, when notifying the TTI bundling information of specific group-calling service, the group calling control message utilized is specifically as follows group calling and sets up message or group calling beep-page message, so, can realize the TTIbundling information configuration of specified cluster group-calling service.
Preferably, described specific group calling business packet draws together the group-calling service that preset service quality (QoS) parameter meets corresponding predetermined target value, and/or signal strength signal intensity area coverage can need the group-calling service reaching default coverage goal value.
Preferably, described qos parameter can be: any one combination in group calling priority parameter, importance parameter and dependability parameter.Wherein, the desired value that each qos parameter is corresponding can be arranged according to actual needs by those skilled in the art.
In said method, corresponding time slot binding information collocation method is sets forth for the super large community in group system and specific group-calling service, the area coverage problem of large community can be solved on the one hand, the QoS requirement of specific group-calling service can be met on the other hand, therefore can optimize the group-calling service quality of group system largely, expand network coverage area.
Because said method is only that TTI bundling configuration is carried out in the community of selecting coverage optimization to need targetedly or group calling (i.e. super large community or specific group-calling service), so, be the management maintenance mode of granularity with tracing area to group calling relative to mobile management entity (MME) in current cluster system, this employing of the present invention, can be avoided not considering cell size or not considering that traffic performance configuration TTI bundling is to the waste of frequency spectrum resource for granularity carries out the mode of TTI bundling configuration with community or group calling.In addition, because the advantage of the present invention in optimizing network coverage can expand cell capacity, thus effectively can reduce the impact of TTI bundling mechanism on spectrum efficiency.Therefore, adopt TTI bundling of the present invention to configure the network coverage both effectively can having guaranteed group system, seldom affect the spectrum efficiency of group system simultaneously.
It should be noted that, in the typical individual calling environment of 3GPP regulation, have HARQ to retransmit due to up, the HARQ retransfer scheduling of TTI bundling is complicated, and time delay is too large.So 3GPP regulation uplink TTI bundling and SPS can not use simultaneously.And in application group system of the present invention, then can introduce semi-persistent scheduling (SPS) mechanism, the TTI bundling namely in the present invention and semi-persistent scheduling can use simultaneously.Such as, VoIP business is applicable to SPS scheduling, so can reduce the expense of control channel, TTIbundling extended voice can also be used to cover simultaneously.HARQ is not had to retransmit because cluster is descending, so TTI bundling and semi-persistent scheduling can use easily simultaneously.
In addition, in group system after descending employing TTI bundling mechanism, distributed virtual resource block (distributed virtual resource block can be supported, DVRB)/local virtual Resource Block (local virtualresource block, LVRB) mapped mode, thus frequency diversity gain can be made full use of.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a time slot binding collocation method for down link, is characterized in that, comprising:
For each super large community in group system, network side binds TTI bundling information for this community arranges time slot, and is informed each colony terminal of this community of access by the mode of broadcast;
When there is specific group-calling service in the community of group system, the base station at place, community is this specific group calling business setting TTI bundling information, and is informed each colony terminal carrying out this specific group-calling service by group calling control message.
2. time slot binding collocation method according to claim 1, is characterized in that, described network side for this community arranges time slot binding TTI bundling information is:
The base station at this place, community arranges TTI bundling information for this community.
3. time slot binding collocation method according to claim 1, is characterized in that, described network side for this community arranges time slot binding TTI bundling information is:
By core net for this community arranges TTI bundling information, and inform the base station at this place, community.
4. time slot binding collocation method according to claim 1, it is characterized in that, described group calling control message is that message or group calling beep-page message are set up in group calling.
5. time slot binding collocation method according to claim 1, it is characterized in that, described specific group calling business packet draws together the group-calling service that preset service quality Q oS parameter meets corresponding goal-selling.
6. time slot binding collocation method according to claim 1, it is characterized in that, described qos parameter comprises: any one combination in group calling priority parameter, importance parameter and dependability parameter.
7. time slot according to claim 1 binding collocation method, is characterized in that, described specific group calling business packet draws together signal strength signal intensity area coverage can need to reach the group-calling service of default coverage goal value.
8. time slot according to claim 1 binding collocation method, is characterized in that, described super large community is that the actual area coverage of business and signal strength signal intensity the ratio of area coverage can be greater than the community of predetermined threshold value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310486482.1A CN104581950B (en) | 2013-10-17 | 2013-10-17 | The time slot binding configuration method of downlink |
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| CN201310486482.1A CN104581950B (en) | 2013-10-17 | 2013-10-17 | The time slot binding configuration method of downlink |
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| CN104581950A true CN104581950A (en) | 2015-04-29 |
| CN104581950B CN104581950B (en) | 2019-01-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016180209A1 (en) * | 2015-09-10 | 2016-11-17 | 中兴通讯股份有限公司 | Data processing method and apparatus |
| WO2017133364A1 (en) * | 2016-02-03 | 2017-08-10 | 电信科学技术研究院 | Uplink control information transmitting method, receiving method, terminal and network side device |
| WO2021223072A1 (en) * | 2020-05-06 | 2021-11-11 | Qualcomm Incorporated | Slot or mini-slot bundling for sidelink communication in a wireless communications network |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102124774A (en) * | 2008-08-18 | 2011-07-13 | 高通股份有限公司 | TTI bundling in a random access procedure |
| CN102281099A (en) * | 2011-08-08 | 2011-12-14 | 电信科学技术研究院 | Method, system and equipment for transmitting data in time division duplex (TDD) radio frame |
| WO2013127634A1 (en) * | 2012-02-29 | 2013-09-06 | Panasonic Corporation | Dynamic subframe bundling |
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2013
- 2013-10-17 CN CN201310486482.1A patent/CN104581950B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102124774A (en) * | 2008-08-18 | 2011-07-13 | 高通股份有限公司 | TTI bundling in a random access procedure |
| CN102281099A (en) * | 2011-08-08 | 2011-12-14 | 电信科学技术研究院 | Method, system and equipment for transmitting data in time division duplex (TDD) radio frame |
| WO2013127634A1 (en) * | 2012-02-29 | 2013-09-06 | Panasonic Corporation | Dynamic subframe bundling |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016180209A1 (en) * | 2015-09-10 | 2016-11-17 | 中兴通讯股份有限公司 | Data processing method and apparatus |
| WO2017133364A1 (en) * | 2016-02-03 | 2017-08-10 | 电信科学技术研究院 | Uplink control information transmitting method, receiving method, terminal and network side device |
| CN107040350A (en) * | 2016-02-03 | 2017-08-11 | 电信科学技术研究院 | Transmission method, method of reseptance, terminal and the network side equipment of ascending control information |
| WO2021223072A1 (en) * | 2020-05-06 | 2021-11-11 | Qualcomm Incorporated | Slot or mini-slot bundling for sidelink communication in a wireless communications network |
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| CN104581950B (en) | 2019-01-11 |
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