CN101527944A - Switching method and base station based on adaptive modulation coding - Google Patents

Switching method and base station based on adaptive modulation coding Download PDF

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CN101527944A
CN101527944A CN200810082754A CN200810082754A CN101527944A CN 101527944 A CN101527944 A CN 101527944A CN 200810082754 A CN200810082754 A CN 200810082754A CN 200810082754 A CN200810082754 A CN 200810082754A CN 101527944 A CN101527944 A CN 101527944A
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base station
signal quality
signal
target
portable terminal
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CN101527944B (en
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沈涛
刘鑫
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ZTE Corp
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Abstract

The invention discloses a switching method and a base station based on adaptive modulation coding. The method comprises the following steps: when a mobile terminal determines a target base station in accordance with a switching condition, sending a switching request message to the target bas station by a base station of the mobile terminal, and carrying a signal quality parameter value of the target base station in the switching request message when the mobile terminal sends the request message; and when the target base station receives a switching request, setting a signal modulation coding mode according to the signal quality parameter value of the target base station in the switching request, and adjusting the signal modulation coding mode automatically according to the quality of a downlink signal in the signaling interaction process and the data transmission process when the mobile terminal is accessed. The method reduces the influence on the downlink data transmission rate and the generation of rate burrs in the switching process, and reduces adverse effects on end user experience.

Description

Changing method and base station based on Adaptive Modulation and Coding
Technical field
The present invention relates to portable terminal handoff technique in the mobile communcations system, relate in particular to changing method and base station based on Adaptive Modulation and Coding AMC (Adaptive Modulation and Coding).
Background technology
The advantage of global microwave access intercommunication Wimax (World Interoperability for Microwave Access) technology itself is to provide a kind of high broadband, service quality QoS is arranged (Quality of Service) broadband wireless data service of ensureing.In the city, the broadband wireless access business can solve the problem of comprehensive access for the big customer, provides broadband data service to the big customer.Because the Wimax coverage is big, and can provide reliable, quality services, for operator, be more conducive to dominate the market fast, more relatively there is very big data traffic requirement Fu Yu grass roots, if adopt wired mode head it off, investment is big and to be limited to every user's average income ARPU (AverageRevenue Per User) value of rural user relatively low, so it is slow to invest withdrawal speed; If adopt the Wimax technology, can solve the voice data integration telecommunication service simultaneously.
Along with the continuous growth of mobile subscriber's quantity, mobile value-added number of users is also in quick growth.IResearch Ai Rui consulting data shows that all in all, the mobile value-added service market scale is significantly growing trend fast.In recent years, the mobile value-added service development is very swift and violent, has accounted for more and more higher ratio in the main business income of operator, and the value-added service income ratio of China Mobile in 2006 reaches 23.5%.The mobile value-added service products ﹠ services are also more and more, from note, multimedia message, CRBT, surfing Internet with cell phone, wireless message interactive service to mobile phone games, mobile TV, mobile payment, mobile IM, Push Email, location-based service, two-dimension code etc., kind is more and more, content is also more and more abundanter, incident is the lifting significantly of mobile message transmission speed, and the value-added service of transmitting based on Large Volume Data will obtain bigger promotion and development.
The increase of the volume of transmitted data of mobile service, to following 3G (3rd Generation, finger 3G (Third Generation) Moblie technology) handoff technique of the Wimax of one of wireless access way has just proposed relative higher requirement, especially in the handoff procedure, influence the problem that the message transmission rate of the down link of user experience reduces most and just shown especially more.
As shown in Figure 1, the method for portable terminal direct-cut operation of the prior art may further comprise the steps:
Step 101, source base station SBS (Source Base Station) is that residing base station regularly sent neighboring broadcast messages MOB_NBR_ADV to portable terminal before portable terminal switched, and comprises the neighbor base station information of source base station in the message;
Above-mentioned neighbor base station information comprises frequency, time response indication, the handover optimization indication parameter of neighbor base station, and the DCD of this neighbor base station (DL Channel Descriptor, the down channel description), UCD information such as (UL channel descriptor, up channel is described).
Step 102, portable terminal is according to the downstream signal of neighbor base station in the neighboring broadcast messages timing detect-message, in case find to satisfy the target neighbor base station of switching condition, just send handoff request message MOB_MSHO_REQ to source base station, comprise the tabulation that all meet the target neighbor base station of MS switching condition in this handoff request message, and send MOB_MSHO_REQ message target neighbor base station signal quality parameter constantly at portable terminal.
Above-mentioned target neighbor base station signal quality parameter finger collection of letters intensity RSSI (Received SignalStrength Indication), or carrier wave and interference-to-noise ratio CINR (Carrier-to-Interference plusNoise Ratio).
Wherein, comprise the numbering of target BS or complete base station identity code BSID (Base Station Identity Code) in the tabulation of target neighbor base station.
Step 103, source base station sends handoff request message HO_Req (HandoffRequest) to IAD, comprises in the message that all meet the tabulation of the target neighbor base station of MS switching condition, and the signal quality parameter of target neighbor base station signal;
Step 104, IAD is transmitted this HO_Req to each target BS TBS (target base station); Target BS n represents in a plurality of target BS one among the figure;
Step 105, target BS returns switching response message HO_Response to IAD;
Step 106, IAD is transmitted this switching response message HO_Response to source base station;
Step 103-106 refers to that source base station lists by IAD in MOB_MSHO_REQ all target BS that satisfy the portable terminal switching condition send handoff request, and the resource of notifying each target BS to carry out switching is prepared;
Step 107, source base station is chosen one or more target BS as recommending target BS according to the message that target BS returns according to certain rule, and, comprise the information of described recommendation target BS in the message to portable terminal transmission switching response message MOB_BSHO_RSP;
Step 108, portable terminal selects the selected final goal base station of a conduct to switch in recommending target BS according to setting rule, and sends switch indicating information MOB_HO_IND to source base station;
The BSID (base station identity code) and the HO_IND_TYPE Indication message that comprise the final goal base station that portable terminal is determined in the switch indicating information, HO_IND_TYPE is used to represent the indication message of portable terminal to source base station, comprises switching normal or switching abandoning or switching three kinds of situations of refusal.
In above-mentioned steps, in most cases select the final goal base station in the recommendation target BS that portable terminal comprises in MOB_BSHO_RSP message, under a few cases, portable terminal selects the final goal base station to be not limited in the above-mentioned recommendation target BS.
Step 109, source base station sends switch indicating information HO_IND to IAD;
Step 110, IAD is transmitted switch indicating information HO_IND to the final goal base station that portable terminal is determined, and the preparation that waits the standby communication terminal access is carried out in the final goal base station; Target BS n represents the final goal base station among the figure herein;
Step 111, portable terminal sends distance measurement request message RNG_REQ (RaNGing REQuest) to the final goal base station;
Step 112, distance measurement request response RNG_RSP is returned to portable terminal in the final goal base station;
Step 113, portable terminal sends user side basic capacity request message SBC_REQ (SS Basic Capability Request) to the final goal base station;
Step 114, user side basic capacity request response SBC_RSP is returned to portable terminal in the final goal base station;
Step 115, portable terminal sends register requirement REG_REQ (REGistration REQuest) to the final goal base station;
Step 116, register requirement response REG_RSP is returned to portable terminal in the final goal base station;
The process of step 111～116 for carrying out common access between portable terminal and base station.
Step 117, normal transfer of data is carried out in the final objective base station of portable terminal and access;
Step 118, the base station initiated Adaptive Modulation and Coding AMC in portable terminal place, the modulation coding mode that uses when adjusting transfer of data between base station and the portable terminal according to the signal quality situation.
In the direct-cut operation of the portable terminal of said method, may there be the obvious decline of a period of time in the transmission rate of down link, forms the speed burr.Though generally being portable terminal, the scene that switch to take place switches to target signal qualities base station preferably from self relatively poor base station of residing radio signal quality, but because the target BS that switches just begins to carry out Adaptive Modulation and Coding after portable terminal is finished switching, then portable terminal rigidly connects fashionable, the modulation coding mode that target BS uses may make the transmission rate of down link can not satisfy the speed that portable terminal is kept before switching, thereby causes the formation of speed burr.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of changing method and base station based on Adaptive Modulation and Coding, reduces the influence of handoff procedure for downlink transmission speed, reduces the generation of speed burr.
In order to address the above problem, the invention provides a kind of changing method based on Adaptive Modulation and Coding, after portable terminal is determined to meet the target BS of switching condition, send handoff request message by the base station, place to described target BS, and in described handoff request message, carry the signal quality parameter value of described target BS when portable terminal sends this request message
After described target BS is received described handoff request, according to the signal quality parameter value signalization modulation coding mode of target BS described in the described handoff request, and adjust the signal modulation coding mode automatically according to downlink signal quality in signalling interactive process when described portable terminal inserts and the data transmission procedure.
Further, described target BS setting signal quality threshold adopts the modulation coding mode of high-order during greater than the signal quality thresholding in signal quality parameter value; When being less than or equal to the signal quality thresholding, signal quality parameter value adopts the modulation coding mode of low order.
Further, described signal quality parameter refers to signal carrier and interference-to-noise ratio or received signal intensity.
Further, described downlink signal quality refers to the signal carrier of downstream signal and the value of interference-to-noise ratio.
Further, described method is applicable to the direct-cut operation of global microwave access intercommunication system.
In order to address the above problem, the present invention also provides a kind of base station based on Adaptive Modulation and Coding, comprises interconnective power control module and protocol process module,
Described protocol process module after being used to receive the handoff request of portable terminal, extracts the described signal of base station mass parameter of carrying in the described handoff request, and sends to described power control module;
Described power control module is used for according to described signal quality parameter signalization modulation coding mode, and adjusts the signal modulation coding mode automatically according to downlink signal quality in signalling interactive process when described portable terminal inserts and the data transmission procedure.
Further, described power control module is used for the setting signal quality threshold, adopts the modulation coding mode of high-order during greater than the signal quality thresholding in signal quality parameter value; When being less than or equal to the signal quality thresholding, signal quality parameter value adopts the modulation coding mode of low order.
Further, described signal quality parameter refers to signal carrier and interference-to-noise ratio or received signal intensity.
Further, described downlink signal quality refers to the signal carrier of downstream signal and the value of interference-to-noise ratio.
Further, described base station is applicable to global microwave access intercommunication system.
In the method for the present invention, the target BS of portable terminal starts the Adaptive Modulation and Coding function after receiving the handoff request of source base station, in the access procedure of subsequent movement terminal, use adaptive modulation coding method and portable terminal to carry out the transfer of data of the mutual and downlink data link of signaling message, reduce handoff procedure for the influence of downlink transmission speed and the generation of speed burr, reduced the harmful effect that the end user is experienced.
Description of drawings
Fig. 1 is the flow chart that portable terminal switches in the prior art;
Fig. 2 is based on the flow chart of the changing method of Adaptive Modulation and Coding among the present invention.
Embodiment
In the method for the present invention, the signal quality of the detected target BS of portable terminal enables target BS startup Adaptive Modulation and Coding function setting signal modulation coding mode when initiating according to switching, and be applied to portable terminal in the switching access procedure of target BS, the transmission rate influence to down link is significantly reduced.
As shown in Figure 2, the method for hard switching based on Adaptive Modulation and Coding may further comprise the steps:
Step 201, source base station regularly sends neighboring broadcast messages MOB_NBR_ADV to portable terminal, comprises the neighbor base station information of source base station in the message;
Step 202, portable terminal is according to the downstream signal of neighbor base station in the neighboring broadcast messages timing detect-message, in case find to satisfy the target neighbor base station of switching condition, just send handoff request message MOB_MSHO_REQ to source base station, comprise the tabulation that all meet the target neighbor base station of portable terminal switching condition in this handoff request message, and send MOB_MSHO_REQ message target neighbor base station signal quality parameter constantly at portable terminal.
Above-mentioned target neighbor base station signal quality parameter is received signal intensity RSSI (Received SignalStrength Indication), or carrier wave and interference-to-noise ratio CINR (Carrier-to-Interference plusNoise Ratio).
Wherein, comprise the numbering of target BS or complete base station identity code BSID (Base Station Identity Code) in the tabulation of target neighbor base station.
Step 203, source base station sends handoff request message HO_Req (HandoffRequest) to IAD; Comprise the tabulation of the target neighbor base station that all meet the portable terminal switching condition and the signal quality parameter of target neighbor base station signal in the above-mentioned message;
Step 204, IAD is transmitted this HO_Req to each target BS TBS (target base station); Target BS n represents in a plurality of target BS one among the figure;
Step 205, after target BS is received HO_Req, start the Adaptive Modulation and Coding function, target BS starts Adaptive Modulation and Coding according to the signal quality parameter (as CINR) of the target BS that carries in the above-mentioned message, and according to signal quality parameter value modulation coding mode is set; Target BS setting signal quality gate limit value during greater than the signal quality threshold value, adopts the modulation coding mode of high-order in signal quality parameter value; When signal quality parameter value is less than or equal to the signal quality threshold value, adopt the modulation coding mode of low order.
Above-mentioned steps also can be understood as source base station when notifying each target BS to prepare switchable resource, uses the signal quality parameter of the downlink wireless signal of each target BS to enable the AMC function of each target BS simultaneously.
Step 206, target BS returns switching response message HO_Response to IAD;
Step 207, IAD is transmitted this switching response message HO_Response to source base station;
Step 208, source base station is chosen one or more target BS as recommending target BS according to the message that target BS returns according to certain rule, and, comprise the information of described recommendation target BS in the above-mentioned message to portable terminal transmission switching response message MOB_BSHO_RSP;
Step 209, portable terminal selects the selected final goal base station of a conduct to switch in recommending target BS according to setting rule, and sends switch indicating information MOB_HO_IND to source base station;
The BSID (base station identity code) and the HO_IND_TYPE Indication message that comprise the final goal base station that portable terminal is determined in the switch indicating information, HO_IND_TYPE is used to represent the indication message of portable terminal to source base station, comprises switching normal or switching abandoning or switching three kinds of situations of refusal.
In above-mentioned steps, in most cases select the final goal base station in the recommendation target BS that portable terminal comprises in MOB_BSHO_RSP message, under a few cases, portable terminal selects the final goal base station to be not limited in the above-mentioned recommendation target BS.
Step 210, source base station sends switch indicating information HO_IND to IAD;
Step 211, IAD is transmitted switch indicating information HO_IND to the final goal base station that portable terminal is determined, and the preparation that waits the standby communication terminal access is carried out in the final goal base station; Target BS n represents the final goal base station among the figure herein;
Step 212, portable terminal sends RNG_REQ to the final goal base station;
Step 213, RNG_RSP is returned to portable terminal in the final goal base station;
Step 214, portable terminal sends SBC_REQ to the final goal base station;
Step 215, SBC_RSP is returned to portable terminal in the final goal base station;
Step 216, portable terminal sends REG_REQ to the final goal base station;
Step 217, REG_RSP is returned to portable terminal in the final goal base station;
The process of step 212～217 for carrying out common access between portable terminal and base station in this process, can directly use the AMC function to begin the mutual of these signalings.
Step 218, normal transfer of data is carried out in the final goal base station of portable terminal and access.
In said method, target BS starts the Adaptive Modulation and Coding function in step 205 after, in step 212～217, use the method and the portable terminal of Adaptive Modulation and Coding to carry out the transmission of signaling message, in step 218, use the method for Adaptive Modulation and Coding and the transfer of data that portable terminal carries out the downlink data link, automatically adjust modulation coding mode according to downlink signal quality in Signalling exchange and the transfer of data and (adopt the modulation coding mode of high-order when setting thresholding greater than target BS as the CINR value of descending signal, the CINR value of downstream signal is less than or equal to the modulation coding mode that adopts low order when target BS is set thresholding), and the signal quality parameter (as CINR value) of this target BS of detecting according to portable terminal in step 205 of target BS carries out the modulating-coding setting, has more reference value than other parameter of employing.Compared to existing technology, said method can reduce the influence of handoff procedure for downlink transmission speed, and reduces the generation of speed burr.
Said method is not only applicable to the Winmax system, also is applicable to other other mobile communication system based on the Adaptive Modulation and Coding technology.
Said method also can be used for the improvement to base station functions.Above-mentioned base station comprises continuous power control module and protocol process module,
Described protocol process module after being used to receive the handoff request of portable terminal, extracts the described signal of base station mass parameter of carrying in the described handoff request, and sends to described power control module;
The power control module is used for according to described signal quality parameter signalization modulation coding mode, and adjusts the signal modulation coding mode automatically according to downlink signal quality in signalling interactive process when described portable terminal inserts and the data transmission procedure.Also be used for the setting signal quality threshold, adopt the modulation coding mode of high-order during greater than the signal quality thresholding in signal quality parameter value; When being less than or equal to the signal quality thresholding, signal quality parameter value adopts the modulation coding mode of low order.
The processing method of base station in handoff procedure is identical with method shown in Figure 2.
The present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making various corresponding changes and distortion according to the present invention, and these change and be out of shape the protection range that all should belong to the appended claim of the present invention accordingly.

Claims (10)

1, a kind of changing method based on Adaptive Modulation and Coding, after portable terminal is determined to meet the target BS of switching condition, send handoff request message by the base station, place to described target BS, and in described handoff request message, carry the signal quality parameter value of described target BS when portable terminal sends this request message, it is characterized in that
After described target BS is received described handoff request, according to the signal quality parameter value signalization modulation coding mode of target BS described in the described handoff request, and adjust the signal modulation coding mode automatically according to downlink signal quality in signalling interactive process when described portable terminal inserts and the data transmission procedure.
2, the method for claim 1 is characterized in that,
Described target BS setting signal quality threshold adopts the modulation coding mode of high-order during greater than the signal quality thresholding in signal quality parameter value; When being less than or equal to the signal quality thresholding, signal quality parameter value adopts the modulation coding mode of low order.
3, method as claimed in claim 1 or 2 is characterized in that,
Described signal quality parameter refers to signal carrier and interference-to-noise ratio or received signal intensity.
4, the method for claim 1 is characterized in that,
Described downlink signal quality refers to the signal carrier of downstream signal and the value of interference-to-noise ratio.
5, the method for claim 1 is characterized in that,
Described method is applicable to the direct-cut operation of global microwave access intercommunication system.
6, a kind of base station based on Adaptive Modulation and Coding comprises interconnective power control module and protocol process module, it is characterized in that,
Described protocol process module after being used to receive the handoff request of portable terminal, extracts the described signal of base station mass parameter of carrying in the described handoff request, and sends to described power control module;
Described power control module is used for according to described signal quality parameter signalization modulation coding mode, and adjusts the signal modulation coding mode automatically according to downlink signal quality in signalling interactive process when described portable terminal inserts and the data transmission procedure.
7, base station as claimed in claim 6 is characterized in that,
Described power control module is used for the setting signal quality threshold, adopts the modulation coding mode of high-order during greater than the signal quality thresholding in signal quality parameter value; When being less than or equal to the signal quality thresholding, signal quality parameter value adopts the modulation coding mode of low order.
8, as claim 6 or 7 described base stations, it is characterized in that,
Described signal quality parameter refers to signal carrier and interference-to-noise ratio or received signal intensity.
9, base station as claimed in claim 6 is characterized in that,
Described downlink signal quality refers to the signal carrier of downstream signal and the value of interference-to-noise ratio.
10, base station as claimed in claim 6 is characterized in that,
Described base station is applicable to global microwave access intercommunication system.
CN2008100827540A 2008-03-05 2008-03-05 Switching method and base station based on adaptive modulation coding Expired - Fee Related CN101527944B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101835221A (en) * 2010-04-28 2010-09-15 新邮通信设备有限公司 Subdistrict switching method and base station
CN103096255A (en) * 2013-01-11 2013-05-08 大唐移动通信设备有限公司 Broadcast news sending method and base station
CN103167596A (en) * 2011-12-16 2013-06-19 中兴通讯股份有限公司 Method and device of power control
CN105336147A (en) * 2015-10-21 2016-02-17 宁波三星医疗电气股份有限公司 Electric-power-user self-adaptive multicarrier modulation mode meter-reading method
CN108040347A (en) * 2017-11-20 2018-05-15 上海华为技术有限公司 A kind of auto-adaptive parameter collocation method and device
CN108702670A (en) * 2018-05-30 2018-10-23 北京小米移动软件有限公司 The processing method and processing device of cell switching

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US8107885B2 (en) * 2002-10-30 2012-01-31 Motorola Mobility, Inc. Method and apparatus for providing a distributed architecture digital wireless communication system
CN1277361C (en) * 2003-10-11 2006-09-27 中兴通讯股份有限公司 Method for receiving mobile station reverse channel quality indicating channel of CDMA base station
JP4543968B2 (en) * 2005-03-04 2010-09-15 富士通株式会社 Wireless base station, mobile station

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101835221A (en) * 2010-04-28 2010-09-15 新邮通信设备有限公司 Subdistrict switching method and base station
CN101835221B (en) * 2010-04-28 2012-05-09 新邮通信设备有限公司 Subdistrict switching method and base station
CN103167596A (en) * 2011-12-16 2013-06-19 中兴通讯股份有限公司 Method and device of power control
CN103167596B (en) * 2011-12-16 2018-03-30 中兴通讯股份有限公司 The method and device of Power Control
CN103096255A (en) * 2013-01-11 2013-05-08 大唐移动通信设备有限公司 Broadcast news sending method and base station
CN103096255B (en) * 2013-01-11 2016-05-11 大唐移动通信设备有限公司 A kind of broadcast message sending method and a kind of base station
CN105336147A (en) * 2015-10-21 2016-02-17 宁波三星医疗电气股份有限公司 Electric-power-user self-adaptive multicarrier modulation mode meter-reading method
CN105336147B (en) * 2015-10-21 2018-08-24 宁波三星医疗电气股份有限公司 Method for power consumer adaptive multi-carrier modulation system meter reading
CN108040347A (en) * 2017-11-20 2018-05-15 上海华为技术有限公司 A kind of auto-adaptive parameter collocation method and device
CN108702670A (en) * 2018-05-30 2018-10-23 北京小米移动软件有限公司 The processing method and processing device of cell switching
US11659455B2 (en) 2018-05-30 2023-05-23 Beijing Xiaomi Mobile Software Co., Ltd. Processing method and apparatus for cell handover

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