CN101340711B - Scheduling information reporting method of multi-carrier enhanced uplink access system - Google Patents
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Abstract
The invention discloses a method for reporting scheduling information of a multi-carrier enhanced uplink access system, which comprises the following steps: s302, calculating the path loss ratio and uplink power margin of the cell and the adjacent cell of each carrier of the multi-carrier enhanced uplink access system; and S304, reporting the path loss ratio of the cell and the adjacent cell of each carrier of the multi-carrier enhanced uplink access system and the scheduling information of the uplink power margin through one of the carriers. The invention can ensure the report of the information required by the multi-carrier scheduling.
Description
Technical Field
The invention relates to the field of communication, in particular to a scheduling information reporting method of a multi-carrier enhanced uplink access system.
Background
An enhanced uplink Access system is generally called a High Speed Uplink Packet Access (HSUPA) system, and is used to improve uplink efficiency through advanced technology, so as to effectively support web browsing, video, multimedia information, and other IP-based services.
Currently, 3GPP (third generation mobile communication partnership organization) has completed standardization work of Time Division synchronization Code Division multiple access (TD-SCDMA for short) enhanced uplink access system, and is applicable to single carrier TD-SCDMA system. An Enhanced Uplink dedicated Channel (E-DCH) is newly added to an Enhanced Uplink (EUL), Enhanced Uplink data is carried on the Enhanced Uplink dedicated Channel (E-DCH), and a Transmission Time Interval (TTI) of the E-DCH is 5 ms. The packet mapped onto the E-DCH transport channel is called an enhanced medium access control protocol data unit (MAC-E PDU).
The enhanced uplink access service is divided into a scheduling service and a non-scheduling service according to different scheduling modes. Wherein, the resource of the non-scheduling service is allocated to the User Equipment (UE) by a Serving Radio Network Controller (SRNC), and the allocation mode is the same as the existing dedicated channel allocation mode; in the scheduling service, the SRNC allocates an enhanced uplink resource pool to a Node B (Node B), and the Node B allocates resources to a single UE.
In the Scheduling service, the UE needs to report some Information to assist the Scheduling of the Node B, where the Information is called Scheduling Information (SI), and includes 23 bits total, such as UE buffer Information, power headroom, and path loss measurement Information of the local cell and neighboring cells. Fig. 1a shows the content of the scheduling information. Wherein, the total buffer status (TEBS) is the total of the data amount to be sent in the logical channel buffer of the UE; the highest priority logical channel state (HLBS) is the buffer data size corresponding to the highest priority logical channel for which data is currently pending; the highest priority logical channel id (hlid) specifically indicates the highest priority logical channel number for which data is to be sent. These three parameters provide a reference for the NodeB to allocate appropriate resources, including channel resources and power resources. The path loss ratio (SNPL) of the cell and the adjacent cell is used for providing reference for the Node B to control the interference of the adjacent cell; the Uplink Power Headroom (UPH) is the transmit power currently available to the UE. When the UE has uplink data to send, the UE may trigger sending of scheduling information. When the UE has no authorization, the UE sends scheduling information through an enhanced random Access Control Channel (E-RUCCH), as shown in fig. 1 b.
In order to further improve the throughput of the system, the existing single carrier enhanced uplink access system introduces the multi-carrier characteristic. Theoretically, N carriers will have N times the throughput of a single carrier system. Under the multi-carrier characteristic, there are various architectures, one of which is: in one TTI, the UE may simultaneously transmit E-DCH data on multiple carriers, and the data blocks transmitted by the carriers are independent of each other. The benefit is that the peak rate of a single UE can be increased.
In the multi-carrier bundling mechanism, it is necessary to improve the single-carrier enhanced uplink access system in many ways to adapt to the situation of multi-carrier transmission.
Disclosure of Invention
In view of one or more of the above problems, the present invention provides a method for reporting scheduling information of a multi-carrier enhanced uplink access system.
The method for reporting the scheduling information of the multi-carrier enhanced uplink access system comprises the following steps: s302, calculating the path loss ratio and uplink power margin of the cell and the adjacent cell of each carrier of the multi-carrier enhanced uplink access system; and S304, reporting the path loss ratio of the cell and the adjacent cell of each carrier of the multi-carrier enhanced uplink access system and the scheduling information of the uplink power margin through one of the carriers.
The invention can ensure the report of the information required by the multi-carrier scheduling.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1a is a schematic diagram of transmission content of single carrier scheduling information under authorization;
fig. 1b is a schematic diagram of transmission content of single carrier scheduling information without authorization;
fig. 2a is a diagram of the contents of transmission of multi-carrier scheduling information under authorization (UPH calculated per primary carrier);
fig. 2b is a diagram of the contents of the transmission of multi-carrier scheduling information under authorization (calculation of UPH independently for each carrier); and
fig. 3 is a flowchart of a scheduling information reporting method of a multi-carrier enhanced uplink access system according to an embodiment of the present invention.
Detailed Description
The report of the scheduling information is an important reference for the Node B to carry out resource scheduling, and certain real-time performance is required; however, scheduling information occupies a certain bandwidth, and reporting the scheduling information from time to time can cause a problem of wasting system resources. The single carrier enhanced uplink system establishes some mechanisms for reporting scheduling information, so that the system overhead is reduced as much as possible and certain real-time performance is ensured.
When a single-carrier enhanced uplink access system introduces multi-carrier characteristics, a multi-carrier binding architecture is provided. In the framework, the Node B can allocate resources of more than one carrier to the UE in one TTI, the UE can simultaneously send E-DCH data on a plurality of carriers in one TTI, and data blocks sent by each carrier are independent. The scheduling information of the multi-carrier enhanced uplink access system is consistent with the scheduling information of the existing single-carrier enhanced uplink access system, and also comprises 5 items of information: total buffer status, highest priority logical channel ID, serving neighbor cell path loss, and uplink power headroom. Wherein the total buffer status, the highest priority logical channel status, and the highest priority logical channel ID are common information, and carriers are not distinguished. Unlike a single carrier, there is one SNPL per carrier. Thus, for N carriers, if the UPH information is calculated from the primary carrier only, the SI has 5 × N +18 bits in total (as shown in fig. 2 a); if each carrier calculates its own UPH information independently, the SI has 10 × N +13 bits in total (as shown in fig. 2 b).
Referring to fig. 3, a method for reporting scheduling information of a multi-carrier enhanced uplink access system according to an embodiment of the present invention is described. As shown in fig. 3, the method for reporting scheduling information includes the following steps:
s302, calculating the path loss ratio and uplink power margin of the cell and the adjacent cell of each carrier of the multi-carrier enhanced uplink access system.
Wherein the UE calculates SNPL for each carrier separately. The UE may measure corresponding path loss information on each carrier, or measure corresponding path loss information only on the primary carrier, and then estimate path loss information on other carriers according to the carrier frequency interval and the path loss model, thereby calculating the SNPL of each carrier.
If the carrier usage of the neighboring cell is notified to the UE through a Radio Network Controller (RNC), the UE may utilize the carrier information of the neighboring cell when calculating the SNPL.
Similar to single carrier, the SNPL of multiple carriers also has the following reporting forms:
1)Full Feedback(full speed)： <math>
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2)Full Feedback(slower speed)： <math>
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3)Partial Feedback(poorest-cell)： <math>
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4)Partial Feedback(geometrical)： <math>
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wherein, <math>
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</math> Lij nis the path loss, L, from the UE measured on carrier n to the base station of the jth neighbor celliJ nThe path loss from the user equipment to the base station of the cell measured on the carrier n. Wherein L isij nIt can be obtained by measuring on each carrier separately, or measuring only on the main carrier, and then obtaining according to the formula of the path loss model. Wherein, the path loss model may be Ln＝G1(fn)+G2(d) In that respect Wherein f isnIs the frequency of the carrier n, d is the distance between the transmitting base station and the receiving user equipment, G1And G2Is a function to be determined. In this case, the path loss of the carrier m is Lm＝G1(fm)-G1(fn)+Ln。
When the neighbor cell j does not use the carrier n, define <math>
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</math> That is, the user equipment is not interfering with the carrier n of the jth neighbor cell base station.
UPH in the single carrier is UPH ═ Pmax, tx/(Pe-base · L). Where, Pmax, tx ═ min (Pul, Pue), Pul is the maximum allowed uplink transmit power configured for the UE by the RNC; pue is the maximum transmit power determined by the UE capability; the Pe-base is expected received power configured by the RNC for the UE, and is controlled by a NodeB closed loop power Control command (TPC for short); and L is a path loss value measured by the UE. The power authorization value distributed by the NodeB for the UE is a relative value of Pe-base, and UPH is the maximum value of the power authorization distributed by the NodeB for the UE.
In multi-carrier, if UPH is calculated only from the primary carrier, UPH ═ Pmax, tx/(Pe-base)1·L1). Wherein, Pe-base1And L1Respectively representing the reference power and the path loss value on the main carrier.
If the UPH is calculated by the sub-carriers, the reference power and the path loss of the ith carrier are respectively Pe-baseiAnd LiThe power headroom of the ith carrier has two calculation methods:
(1)UPHi＝Pmax，tx/(Pe-basei·Li)；
(2) the UE assigns Pmax, tx to each carrier, UPHi＝Pmax，txi/(Pe-basei·Li). Wherein Pmax, txiIs the maximum transmit power allocated for the ith carrier. There are two power allocation approaches:
(1) evenly distributed, i.e.
(2) According to SNPL allocation per carrier, i.e. <math>
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</math> If SNPL is large, interference to neighbor cells is small, and allocable transmission power is large. Where N is the number of carriers.
Wherein, when RNC configures a Pul for each carrier of each UE according to the interference situation of different carriersiIn time, each carrier can calculate UPH in the following 3 ways:
(1)UPHi＝min(Pue，Puli)/(Pe-basei·Li)；
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wherein, when the RNC configures only one Pul for each UE, each carrier may calculate the UPH in the following 3 ways:
(1)UPHi＝min(Pue，Pul)/(Pe-basei·Li)
s304, reporting the path loss ratio of the cell and the adjacent cell of each carrier of the multi-carrier enhanced uplink access system and the scheduling information of the uplink power margin through one of the carriers.
In summary, the scheduling information reporting method according to the embodiment of the present invention mainly considers that different carriers have different SNPL information and should report the SNPL information respectively. In addition, the UPH can be calculated only according to the main carrier, so that resources occupied by the reported information are saved; it is also possible to calculate separately for each carrier, so that more accurate UPH information can be obtained.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A method for reporting scheduling information of a multi-carrier enhanced uplink access system is characterized by comprising the following steps:
s302, calculating a path loss ratio SNPL and an uplink power margin UPH of a local cell and an adjacent cell of each carrier of the multi-carrier enhanced uplink access system; and
and S304, reporting the scheduling information comprising the path loss ratio of the cell and the adjacent cell of each carrier of the multi-carrier enhanced uplink access system and the uplink power margin through one of the carriers.
2. The method according to claim 1, wherein the step of calculating the path loss ratio between the local cell and the neighboring cell of each carrier comprises the following steps:
measuring the path loss information of each carrier; and
and calculating the path loss ratio of the local cell and the adjacent cell of each carrier according to the measured path loss information of each carrier.
3. The method according to claim 1, wherein the step of calculating the path loss ratio between the local cell and the neighboring cell of each carrier comprises the following steps:
measuring the path loss information of a main carrier of the multi-carrier enhanced uplink access system;
according to the carrier frequency interval and the path loss model of the multi-carrier enhanced uplink access system, calculating the path loss information of each carrier except the main carrier of the multi-carrier enhanced uplink access system by using the path loss information of the main carrier; and
and calculating the path loss ratio of the local cell and the adjacent cell of each carrier according to the calculated path loss information of each carrier.
4. The method according to claim 2 or 3, wherein the path loss ratio between the local cell and the neighboring cell of each carrier is reported by at least one of the following reporting manners: the Full Feedback corresponds to the situation that the Full speed feeds back the path loss ratio of the cell and the adjacent cell:
the Full Feedback corresponds to the case that the slow slowers desired feeds back the path loss ratio of the cell to the neighbor cell:
j ═ 1, 2, 3. }, partial feedback PaThe real Feedback corresponds to the situation of only feeding back the path loss ratio of the cell with the strongest interference, namely the poorest-cell, and the neighboring cell:
partial Feedback corresponds to the situation that geometric feeds back the path loss ratio of the cell and the adjacent cell:
wherein,
is the measured path loss from the user equipment on carrier n to the base station of the jth neighbor cell,
the path loss from the user equipment to the base station of the cell measured on the carrier n.
5. The method of claim 4, wherein the path loss model is Ln＝G1(fn)+G2(d) Wherein f isnIs the frequency of the carrier n, d is the distance between the transmitting base station and the receiving user equipment, G1And G2Is a function to be determined.
6. The method according to claim 3, wherein when the uplink power headroom of each carrier is calculated according to the related information of the primary carrier, the uplink power headroom of each carrier is UPH (Pmax), tx/(Pe-base), and the like1·L1) Wherein Pmax, tx represents the maximum transmitting power of the multi-carrier enhanced uplink access system, Pe-base1Indicating the reference power, L, of the main carrier of the multi-carrier enhanced uplink access system1And indicating the path loss information of the main carrier of the multi-carrier enhanced uplink access system.
7. The method according to claim 2 or 3, wherein when the uplink power headroom of each carrier is calculated according to the related information of each carrier, the uplink power headroom of each carrier is UPHi＝Pmax，tx/(Pe-basei·Li) Wherein Pmax, tx represents the maximum transmitting power of the multi-carrier enhanced uplink access system, Pe-baseiIndicating the reference power, L, of the ith carrier of the multi-carrier enhanced uplink access systemiAnd the path loss information represents the path loss information of the ith carrier of the multi-carrier enhanced uplink access system.
8. The method according to claim 2 or 3, wherein when the uplink power headroom of each carrier is calculated according to the related information of each carrier, the uplink power headroom of each carrier is UPHi＝Pmax，txi/(Pe-basei·Li) Where Pmax, txiRepresents the maximum transmission power, Pe-base, allocated to the ith carrier of the multi-carrier enhanced uplink access systemiIndicating the reference power, L, of the ith carrier of the multi-carrier enhanced uplink access systemiAnd the path loss information represents the path loss information of the ith carrier of the multi-carrier enhanced uplink access system.
9. The method of claim 8, wherein the maximum transmission power allocated to the ith carrier of the multi-carrier enhanced uplink access system is
Wherein Pmax and tx represent the maximum transmitting power of the multi-carrier enhanced uplink access system, and N is the number of carriers.
10. The method of claim 8, wherein the maximum transmission power allocated to the ith carrier of the multi-carrier enhanced uplink access system is
Pmax, tx represents the maximum transmitting power of the multi-carrier enhanced uplink access system, SNPLiAnd n represents the number of the carriers of the multi-carrier enhanced uplink access system.
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