CN104955155A - PDSCH data receiving method, transmitting method, user equipment and eNB - Google Patents
PDSCH data receiving method, transmitting method, user equipment and eNB Download PDFInfo
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Abstract
The invention discloses a PDSCH data receiving method, a transmitting method, user equipment and an eNB, and relates to the technical field of an LTE mobile communication system. Downlink pre-located scheduling is performed on all UE by the method, and existence of continuous idle resources in an ePDCCH area at a certain time slot is judged by the eNB after scheduling. Besides, certain UE which is not scheduled exists due to insufficiency of PDSCH resources, and the eNB configures PDSCH data transmitted in the ePDCCH area by the UE. When the UE receives downlink data, candidate eCCE in the ePDCCH is detected firstly. If DCI information indication is detected, the UE utilizes the indicated addressing information to start receiving DCI information and the PDSCH data thereof at the corresponding position. With application of the method, the equipment and the eNB, business channel data can be transmitted by utilizing the ePDCCH resources when control channel resource utilization rate is insufficient so that resource utilization rate can be enhanced.
Description
Technical Field
The present invention relates to the technical field of LTE (Long Term Evolution) mobile communication systems, and in particular, to a PDSCH data receiving method, a PDSCH data transmitting method, user equipment, and an Enhanced Node Base (eNB).
Background
The 3GPP (3 rd Generation Partnership Project) LTE system is a long term evolution version of 3G (3 rd Generation, third Generation mobile communication system). Compared with the existing mobile communication systems such as GSM (Global System for mobile communications), WCDMA (Wideband code division Multiple Access), CDMA2000 and the like, the LTE System provides higher user peak rate, larger coverage, better Quality of Service (QoS) of cell users and the like. The LTE-a (LTE-Advanced) system is an enhanced version of LTE, which proposes a more competitive system performance index.
The LTE and LTE-a (LTE-Advanced, long term evolution-Advanced) systems adopt OFDMA (Orthogonal Frequency Division Multiple Access) technology in downlink, and SC-FDMA (single carrier-Frequency Division Multiple Access) technology with low peak-to-average ratio in uplink. In addition, the Multiple antenna technology MIMO (Multiple Input Multiple output) employed in the system provides spatial multiplexing gain as well as transmit diversity gain. Therefore, available resources of LTE and LTE-a systems include dimensions such as time domain, frequency domain, and space domain, and a base station flexibly and reasonably allocates appropriate time slots, PRB (Physical Resource Block), MCS (Modulation and Coding Scheme), transmission power, MIMO transmission Scheme, and the like to users based on channel information of users in a cell through a scheduling and Resource allocation algorithm, so as to improve system throughput and meet the rate requirements of users at the edge of the cell.
In LTE and LTE-a systems, Control signaling Information of a Downlink Channel is transmitted by various types of DCI (Downlink Control Information), and the DCI is carried by a PDCCH (Physical Downlink Control Channel).
In a 10ms frame structure defined by LTE and LTE-a systems, a 1ms downlink subframe corresponds to one TTI (Transmission Time Interval). In one TTI, the PDCCH occupies the first n (n < = 3) OFDM (orthogonal frequency Division Multiplexing) symbols in the time domain, and occupies the entire system bandwidth in the frequency domain. Other channels include, for example, a reference signal, a PCFICH (Physical control Format Indicator Channel), a PHICH (Physical HARQ Indicator Channel), and the like. Therefore, in each downlink subframe, only a limited number of reserved time-frequency resources are available for transmitting downlink control information, i.e. the available time-frequency resources of the PDCCH carrying DCI information are very limited.
The minimum unit of PDCCH Resource allocation is CCE (Control Channel Element), where 1 CCE includes 9 REGs (Resource Element Group), and one REG includes 4 REs (Resource Element), so that one CCE includes 36 REs. The LTE and LTE-a standards specify that four types of AL (Aggregation Level) are allowed for CCEs, where AL =1, 2, 4, and 8, and 1, 2, 4, or 8 CCEs are simultaneously occupied for one PDCCH channel.
According to different types of transmitted DCI, the PDCCH comprises two types of search spaces: CSS (Common Search Space) and USS (UE-specific Search Space). The CSS location is fixed, common detection information is placed, and the USS is used to transmit information related to individual users, and the spatial resource mapping requires PDCCH resource allocation determination by the base station for the users scheduled in the cell. In the two types of search spaces, a User demodulates DCI information in a PDCCH by using a blind detection method, and each UE (User Equipment) simultaneously monitors a PDCCH candidate set in a cell USS and tries to demodulate one by one.
In the LTE-A R11 release standard definition, an ePDCCH (enhanced pdcch, enhanced downlink physical control channel) is introduced, and in summary, by occupying the original PDSCH resources, the capacity of the control signaling is extended, and at the same time, the downlink control signaling can obtain a frequency selection gain and the like. However, the ePDCCH resource is configured semi-statically, and the resource location where the ePDCCH resource is located is indicated through a high-level signaling, which extends the capacity of the physical downlink control channel, but also loses part of the flexibility of the PDCCH real-time scheduling in the R10 version, and also brings some hidden dangers.
Disclosure of Invention
The inventors of the present invention have found that there are problems in the above-mentioned prior art, and thus have proposed a new technical solution to at least one of the problems.
An object of the present invention is to provide a technical solution for PDSCH data transmission.
According to a first aspect of the present invention, a method for receiving PDSCH data of a physical downlink shared channel is provided, including: the user equipment receives downlink data and detects DCI information indication in a user exclusive search space; the user equipment judges whether the PDSCH data is transmitted in an ePDCCH region or a PDSCH region according to the DCI information indication; if the PDSCH data are transmitted in the ePDCCH region, the user equipment acquires the PDSCH data in the ePDCCH region according to the DCI information indication; and if the PDSCH data is transmitted in the PDSCH region, the user equipment acquires the PDSCH data in the PDSCH region according to the DCI information indication.
Optionally, the detecting, by the user equipment, the DCI information indication in the user-specific search space comprises: the user equipment detects DCI information indication in a preset eCCE of a user dedicated search space;
or the user equipment detects the DCI information indication at a first candidate eCCE (enhanced Control Channel Element) of the user-specific search space AL = 1.
Optionally, the DCI information indicates transmission in one eCCE; and/or
The DCI information indication comprises a DCI format indication and a DCI position information, and respectively indicates whether PDSCH data of the user equipment is transmitted in ePDCCH resources and the DCI position of the DCI information of the user equipment; and/or
The DCI information indicates scrambling using a C-RNTI (Cell Radio network temporary identity) of the UE.
Optionally, the determining, by the user equipment according to the DCI information indication, that the PDSCH data is transmitted in the ePDCCH region or transmitted in the PDSCH region includes: the user equipment determines that the PDSCH data is transmitted in an ePDCCH region or transmitted in a PDSCH region according to the DCI format indication;
or,
the user equipment obtains the PDSCH data in the ePDCCH region according to the DCI information indication, and the method comprises the following steps: the user equipment determines the position of the DCI information in the ePDCCH region according to the DCI position information;
the user equipment obtains PDSCH data after DCI information in an ePDCCH region; or
And the user equipment analyzes the DCI information to obtain the position of the PDSCH data in the ePDCCH region.
Optionally, the obtaining, by the user equipment, PDSCH data in the PDSCH region according to the DCI information indication includes: the user equipment determines the position of the DCI information in the ePDCCH region according to the DCI position information; and the user equipment analyzes the DCI information to obtain the position of the PDSCH data in the PDSCH region.
According to another aspect of the present invention, there is provided a user equipment comprising: an indication detection module, configured to receive downlink data and detect DCI information indication in a user-specific search space; a transmission region judgment module, configured to determine, according to the DCI information indication, that PDSCH data is transmitted in an ePDCCH region or in a PDSCH region of a physical downlink shared channel; a data service acquisition module, configured to, if PDSCH data is transmitted in an ePDCCH region, obtain PDSCH data in the ePDCCH region according to the DCI information indication; and if the PDSCH data is transmitted in the PDSCH region, obtaining the PDSCH data in the PDSCH region according to the DCI information indication.
Optionally, the detection module is instructed to detect the DCI information indication at a predetermined eCCE of the user-specific search space, or the detection module is instructed to detect the DCI information indication at a first candidate eCCE of the user-specific search space AL = 1.
Optionally, the DCI information indication includes a DCI format indication and DCI position information.
Optionally, the transmission region determining module determines that the PDSCH data is transmitted in the ePDCCH region or in the PDSCH region according to the DCI format indication.
Optionally, the data service acquiring module includes: the first data acquisition unit is used for determining the position of the DCI information in the ePDCCH region according to the DCI position information; obtaining PDSCH data after DCI information in an ePDCCH region; the second data acquisition unit is used for determining the position of the DCI information in the ePDCCH region according to the DCI position information; and analyzing the DCI information to obtain the position of the PDSCH data in the PDSCH region.
According to another aspect of the present invention, a method for transmitting PDSCH data, includes: carrying out downlink pre-allocation scheduling on each UE; the eNB determines that continuous idle resources exist in an ePDCCH region of a time slot, and the continuous idle resources can be used as identifiable idle resources of the UE which is not scheduled; the eNB configures DCI information indication in a preset eCCE of a user dedicated search space of the UE to indicate that PDSCH data of the UE is transmitted in an ePDCCH region and position information thereof, and the eNB transmits the PDSCH data of the UE on identifiable idle resources in the ePDCCH region.
Optionally, the predetermined eCCE of the user-specific search space is a first candidate eCCE of the user-specific search space of AL = 1.
Optionally, the DCI information indication includes a DCI format indication and DCI position information, and indicates whether PDSCH data of the user equipment is transmitted in ePDCCH resources and a DCI position of the DCI information of the user equipment, respectively.
Optionally, the DCI information indication is transmitted in one eCCE, and/or the DCI indication information is scrambled using a C-RNTI of the UE.
According to still another aspect of the present invention, there is provided an eNB including: a downlink preallocation scheduling module, which is used for carrying out downlink preallocation scheduling on each UE; an idle resource determining module, configured to determine that continuous idle resources exist in an ePDCCH region of a timeslot, where the continuous idle resources may be identified idle resources of an unscheduled UE; the system comprises an information indication configuration module and a service data transmission module, wherein the information indication configuration module is used for configuring DCI information indication in a preset eCCE of a user dedicated search space of the UE so as to indicate the transmission of PDSCH data of the UE in an ePDCCH region and the position information of the PDSCH data in the ePDCCH region, and the service data transmission module is used for transmitting the PDSCH data of the UE on identifiable idle resources in the ePDCCH region.
Optionally, the predetermined eCCE of the user-specific search space is a first candidate eCCE of the user-specific search space of AL = 1.
Optionally, the DCI information indication includes a DCI format indication and DCI position information, and indicates whether PDSCH data of the user equipment is transmitted in ePDCCH resources and a DCI position of the DCI information of the user equipment, respectively.
Optionally, the DCI information indication is transmitted in one eCCE, and/or the DCI indication information is scrambled using a C-RNTI of the UE.
One advantage of the present invention is that when the control channel resource utilization rate is insufficient, the service channel data can be transmitted by using the ePDCCH resource, thereby improving the resource utilization rate.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
The invention will be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
fig. 1 illustrates a flowchart of one embodiment of a PDSCH data transmission method according to the present invention;
fig. 2 illustrates a flowchart of one embodiment of a PDSCH data receiving method according to the present invention;
fig. 3 illustrates a flowchart of another embodiment of a PDSCH data transmission method according to the present invention;
fig. 4 shows a flowchart of another embodiment of a PDSCH data receiving method according to the present invention;
FIG. 5 shows a block diagram of one embodiment of a user equipment in accordance with the present invention;
fig. 6 illustrates a block diagram of an embodiment of an eNB according to the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The ePDCCH is introduced to increase the capacity of the downlink control channel so as not to become the bottleneck of the system capacity under the large background of high-speed increase of the traffic quantity, and meanwhile, the coverage of the control channel can be increased by using beamforming and frequency selective gain. Unlike the PDCCH which dynamically indicates resources through a PCFICH channel, the number of resources of the ePDCCH in each subframe is indicated semi-statically through higher layer signaling.
The inventor has noted that in an extreme case, only one UE performs scheduling in the time slot in a certain semi-static configuration period, and when the amount of data to be transmitted is extremely large, the remaining ePDCCH resource still cannot be utilized by the PDSCH channel. Generally, when there is a large traffic and a small traffic, a semi-static configuration may allocate more available physical resources of a control channel because of the need to take care of the capacity of the control channel of the small traffic, but when there is a period during this period, the small traffic is transmitted less and the large traffic is more, there is a possibility that the ePDCCH channel resources are rich and the PDSCH resources are insufficient, and the resources are not fully utilized.
Based on the above observation, the present inventors introduced a new technical scheme, which fully utilizes the flexible scheduling characteristics of the LTE system, and the eNB can schedule PDSCH data with small traffic data UE in ePDCCH resources, and use the whole PDSCH resources for transmitting large traffic data, so that the resources can be fully utilized.
Fig. 1 illustrates a flowchart of one embodiment of a PDSCH data transmission method according to the present invention.
As shown in fig. 1, in step 102, the eNB pre-allocates downlink resources and performs downlink pre-allocation scheduling on all UEs.
The downlink pre-allocation can be to perform preliminary scheduling on all UEs according to a conventional downlink allocation scheduling manner. The downlink pre-allocation may also be an optimized pre-allocation scheduling manner, for example, a UE with a large PDSCH data size is pre-allocated preferentially in the PDSCH region to transmit PDSCH data.
Step 104, the eNB determines whether the "trigger condition" is satisfied according to the result of the pre-allocation. If so, step 106 is continued, otherwise, step 110 is continued.
In an embodiment, the "trigger condition" for data transmission is specifically that downlink PDSCH data of a certain UE may be accommodated on a continuous eCCE that is not yet utilized after pre-allocation on an ePDCCH, that is, on an identified idle resource. For example, after scheduling, the eNB determines that there are consecutive idle resources in the ePDCCH region in the timeslot, and there are UEs that are not scheduled due to insufficient PDSCH resources, and PDSCH data of the UEs that are not scheduled may be transmitted on the consecutive idle resources in the ePDCCH region, that is, there are identifiable idle resources in the ePDCCH region, and then the eNB may configure the UE to transmit PDSCH data in the ePDCCH region.
And 106, the eNB allocates control channel resources and data channel resources in the ePDCCH for the UE meeting the conditions.
If the eNB schedules PDSCH data transmission of a UE in ePDCCH, the eNB may configure DCI information indication in a first candidate eCCE of a search space of the UE, for example, AL =1, to indicate that the UE is to transmit PDSCH data in ePDCCH resources and indicate its location. Then, DCI information of the UE is configured at the indicated position, and PDSCH data of the UE is transmitted immediately after the DCI information. The DCI information indication and the format of the DCI information will be described later in detail.
Step 108, sending data, entering the next TTI, and continuing to step 102.
Step 110, the eNB sends data according to the pre-allocation condition, enters the next TTI, and continues with step 102.
Specific implementations of DCI information indication are described below. In one embodiment, the DCI information indication comprises a DCI format indication and a location indication. The DCI format indication may include more than 4 bits (bits), indicating the specific format of the DCI information. Typically 4 bits, may fully contain all possible DCI formats. The bit number of the position indication may be set according to the configuration of EPDCCH resources of different sizes on the system side, for example, the position indication may include 4 bits, and 16 default starting positions of the system and the UE may be addressed. In one embodiment, the DCI information indication may scramble cell information of the UE in addition to the DCI format indication and the location indication.
The DCI information indication of the preset format is that the default configuration of the system and the UE is good in advance, and the UE can complete the analysis according to the agreed format. The method has compatibility, the UE only needs to perform blind detection once before a blind detection program starts, and if DCI information indication of a preset format is detected, the technical scheme of the disclosure is executed; if the DCI information indication of the predetermined format is not detected, the existing blind detection procedure is continuously executed.
The DCI information configured in the embodiments of the present disclosure indicates UE partial control information, such as whether to be new data, and indicates the number of eCCE resources occupied by PDSCH data thereof. If the PDSCH data is transmitted at a location subsequent to the DCI information, there is no need to include resource location indications for the PDSCH data. Of course, the DCI information may also include a resource location indication of the PDSCH data, and the user equipment determines the location of the PDSCH data according to the resource location indication. It should be noted that, when PDSCH data is transmitted in the EPDCCH region and in the PDSCH region, the format and meaning of the resource location indication are different. Specifically, which format is used is indicated by the DCI format indication in the DCI information indication. The DCI for downlink transmission currently includes DCI1,1A, 1B, 1C, 1D, 2,2A, 2B, 2C, and the like.
In one embodiment, the eNB determines whether a "trigger condition" is satisfied, that is, an ePDCCH region of a certain timeslot after pre-allocation has enough identifiable free resources for a certain UE that has not been pre-scheduled. For example, the "identifiable idle resource" defining the UE satisfies the following condition:
1) resources that can be fully indicated in one DCI information, which is a DCI defined in the scheme, whose resource indication is specific to the ePDCCH space;
2) the control signaling of a certain UE which is not scheduled due to insufficient PDSCH resources and the downlink transmission data thereof are enough to be transmitted in the resources;
3) and if the predetermined eCCE of the search space of the UE has not been allocated, e.g., the first candidate eCCE of AL =1 has not been allocated, the eNB schedules the UE to transmit PDSCH data in ePDCCH resources.
Fig. 2 shows a flowchart of one embodiment of a PDSCH data receiving method according to the present invention.
As shown in fig. 2, in step 202, the ue receives downlink data.
In step 204, the ue detects DCI information indication in the user-specific search space. The DCI information indication may be transmitted in one eCCE to indicate a DCI format and location information. When receiving downlink data, the UE detects, for example, a first candidate eCCE of a search space with AL =1, 2, or 4, and detects whether there is a DCI information indication.
And step 206, the user equipment judges whether the PDSCH data is transmitted in the ePDCCH region or the PDSCH region according to the DCI information indication. The DCI format of the PDSCH data transmitted in the ePDCCH region is different from the DCI format of the PDSCH data transmitted in the PDSCH region. If PDSCH data is transmitted in the ePDCCH region, continue with step 208; if PDSCH data is transmitted in the PDSCH region, step 210 is continued.
And step 208, the user equipment acquires the PDSCH data in the ePDCCH region according to the DCI information indication. The user equipment obtains the position of the DCI information and the PDSCH data in the ePDCCH region according to the position information included in the DCI information indication, or the user equipment obtains the position of the DCI information according to the position information included in the DCI information indication, and obtains the position of the PDSCH data in the ePDCCH region according to the resource position indication included in the DCI information.
And step 210, the user equipment acquires PDSCH data in the PDSCH region according to the DCI information indication. And the user equipment acquires the position of the DCI information according to the position information included in the DCI information indication, and acquires the position of the PDSCH data in the PDSCH region according to the DCI information.
Compared with the prior art, a scheme is provided in the aspect of a downlink control channel of an LTE-a system, so that under certain conditions, when the utilization rate of control channel resources is insufficient, the ePDCCH resources can be used for transmitting PDSCH data, and the resource utilization rate is improved.
Fig. 3 shows a flowchart of another embodiment of a PDSCH data transmission method according to the present invention.
As shown in fig. 3, in step 302, the system performs downlink pre-allocation scheduling for all UEs.
Step 304, the eNB allocates PDSCH resources to the scheduled UE.
Step 306, when the eNB sends downlink data to the UE, after pre-scheduling the downlink data in a certain time slot, the eNB determines whether there is an unscheduled UE? If so, step 308 continues, otherwise, step 314 continues.
Step 308, the eNB determines whether the slot has identifiable idle resources for a certain UE in the ePDCCH region, if so, the eNB continues to step 310, and the eNB configures the UE to transmit PDSCH data in the ePDCCH region; otherwise, step 306 is continued.
In step 310, the eNB configures, in the downlink control information of the UE, a first candidate space whose AL =1 as a DCI information indication indicating that PDSCH data thereof can be transmitted in an ePDCCH region, and in which candidate space a start position of the DCI information is.
In step 312, the eNB configures DCI in the identifiable idle resource of the UE in the ePDCCH region, and transmits PDSCH data of the UE. New format DCI is transmitted in its DCI starting space, indicating that its data is transmitted PDSCH data in the identifiable resource region indicated by the DCI.
Step 314, sending data, and entering the next TTI.
Fig. 4 shows a flowchart of another embodiment of a PDSCH data receiving method according to the present invention.
As shown in fig. 4, in step 402, the UE receives downlink information transmitted by the eNB.
In step 404, the UE detects a DCI format indication and a location indication in a first candidate space AL =1 of the user-specific search space.
In step 406, the UE determines whether PDSCH data is transmitted in an ePDCCH region according to the DCI format indicator? If so, step 408a is continued, otherwise, step 408b is continued.
And step 408a, receiving DCI information at the corresponding position of the ePDCCH region according to the position indication.
Step 410a, receiving PDSCH data at the position after the DCI information in the ePDCCH region, and continuing with step 412.
And step 408b, receiving the DCI information at the corresponding position of the ePDCCH region according to the position indication.
Step 410b, receiving PDSCH data in the PDSCH region according to the location information included in the DCI information, demodulating PDSCH data, and finally completing transmission of downlink data, and continuing to step 412.
Step 412, enter the next TTI.
Fig. 5 shows a block diagram of an embodiment of a user equipment according to the invention. As shown in fig. 5, the user equipment includes: an indication detection module 51, configured to receive downlink data and detect a DCI information indication in a user-specific search space; a transmission region judgment module 52, configured to determine, according to the DCI information indication, that PDSCH data is transmitted in an ePDCCH region or in a PDSCH region of a physical downlink shared channel; a data service obtaining module 53, configured to obtain PDSCH data in an ePDCCH region according to DCI information indication if the PDSCH data is transmitted in the ePDCCH region; and if the PDSCH data is transmitted in the PDSCH region, obtaining the PDSCH data in the PDSCH region according to the DCI information indication. The indication detection module 51 detects a DCI information indication at a predetermined eCCE of the user-specific search space, e.g., instructs the detection module to detect a DCI information indication at a first candidate eCCE of the user-specific search space AL = 1.
The DCI information indication may include a DCI format indication and DCI position information. And the transmission region judgment module determines that the PDSCH data is transmitted in the ePDCCH region or the PDSCH region according to the DCI format indication.
In one embodiment, the data service acquisition module 53 includes: a first data obtaining unit 531, configured to determine, according to the DCI position information, a position of the DCI information in the ePDCCH region; obtaining PDSCH data after DCI information in an ePDCCH region; the second data acquisition unit 532 is used for determining the position of the DCI information in the ePDCCH region according to the DCI position information; and analyzing the DCI information to obtain the position of the PDSCH data in the PDSCH region.
Fig. 6 illustrates a block diagram of an embodiment of an eNB according to the present invention. As shown in fig. 6, the eNB includes: a downlink preallocation scheduling module 61, configured to perform downlink preallocation scheduling for each UE; an idle resource determining module 62, configured to determine that continuous idle resources exist in an ePDCCH region of the timeslot, where the continuous idle resources can be identified as idle resources of an unscheduled UE; the system comprises an information indication configuration module 63 for configuring DCI information indication in a predetermined eCCE of a user-specific search space of the UE so as to indicate the transmission of PDSCH data of the UE in an ePDCCH region and the position information thereof, and a service data transmission module 64 for transmitting the PDSCH data of the UE on an identifiable idle resource of the ePDCCH region. For example, the predetermined eCCE of the user-specific search space is a first candidate eCCE of the user-specific search space of AL = 1.
In one embodiment, the DCI information indication includes a DCI format indication and DCI location information indicating whether PDSCH data of the user equipment is transmitted in ePDCCH resources and a DCI location of the DCI information of the user equipment, respectively. For example, the DCI information indication is transmitted in one eCCE, or the DCI indication information is scrambled using C-RNTI of the UE.
Compared with the prior art, the scheme for transmitting the PDSCH in the ePDCCH residual space is provided in the aspect of the downlink control channel of the LTE-A system, so that under certain conditions, when the resource utilization rate of the control channel is insufficient, service channel data can be transmitted by utilizing ePDCCH resources, and the resource utilization rate is improved.
So far, the PDSCH data receiving method, transmitting method, user equipment and eNB according to the present invention have been described in detail. Some details well known in the art have not been described in order to avoid obscuring the concepts of the present invention. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented in software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (18)
1. A method for receiving Physical Downlink Shared Channel (PDSCH) data is characterized by comprising the following steps:
the user equipment receives downlink data and detects DCI information indication in a user dedicated search space;
the user equipment judges whether PDSCH data is transmitted in an enhanced physical downlink control channel (ePDCCH) region or a PDSCH region according to the DCI information indication;
if the PDSCH data are transmitted in the ePDCCH region, the user equipment acquires the PDSCH data in the ePDCCH region according to the DCI information indication;
and if the PDSCH data is transmitted in the PDSCH region, the user equipment indicates to obtain the PDSCH data in the PDSCH region according to the DCI information.
2. The method of claim 1, wherein the user equipment detecting the DCI information indication in a user-specific search space comprises:
the user equipment detects DCI information indication in a predetermined enhanced control channel element (eCCE) of a user dedicated search space;
or
The user equipment detects a DCI information indication at a first candidate eCCE of a user-specific search space AL = 1.
3. The method according to claim 1 or 2, wherein the DCI information indicates transmission in one eCCE;
and/or
The DCI information indication comprises a DCI format indication and a DCI position information, and indicates whether PDSCH data of the user equipment is transmitted in ePDCCH resources and the DCI position of the DCI information of the user equipment respectively;
and/or
The DCI information indicates that cell radio network temporary identity (C-RNTI) scrambling of the user equipment is used.
4. The method of claim 3, wherein the determining, by the user equipment, that the PDSCH data is transmitted in an ePDCCH region or transmitted in a PDSCH region according to the DCI information indication comprises:
the user equipment determines that PDSCH data is transmitted in an ePDCCH region or transmitted in a PDSCH region according to the DCI format indication;
or,
the obtaining, by the user equipment, PDSCH data in an ePDCCH region according to the DCI information indication includes:
the user equipment determines the position of the DCI information in an ePDCCH region according to the DCI position information;
the user equipment obtains PDSCH data after the DCI information in an ePDCCH region;
or
And the user equipment analyzes the DCI information to obtain the position of the PDSCH data in an ePDCCH region.
5. The method of claim 3, wherein the UE obtaining PDSCH data in a PDSCH region according to the DCI information comprises:
the user equipment determines the position of the DCI information in an ePDCCH region according to the DCI position information;
and the user equipment analyzes the DCI information to obtain the position of the PDSCH data in the PDSCH region.
6. A user device, comprising:
an indication detection module, configured to receive downlink data and detect a DCI information indication in a user-specific search space;
a transmission region judgment module, configured to determine, according to the DCI information indicator, that PDSCH data of a physical downlink shared channel is transmitted in an enhanced physical downlink control channel (ePDCCH) region or transmitted in a PDSCH region of the physical downlink shared channel;
a data service acquisition module, configured to, if PDSCH data is transmitted in an ePDCCH region, obtain PDSCH data in the ePDCCH region according to the DCI information indication; and if the PDSCH data is transmitted in the PDSCH region, obtaining the PDSCH data in the PDSCH region according to the DCI information indication.
7. The UE of claim 6, wherein the indication detection module detects the DCI information indication at a predetermined eCCE of a UE-specific search space;
or (b).
The indication detection module detects a DCI information indication at a first candidate eCCE of a user-specific search space of AL = 1.
8. The UE of claim 6 or 7, wherein the DCI information indication comprises a DCI format indication and DCI location information.
9. The UE of claim 8, wherein the transmission region determining module determines that the PDSCH data is transmitted in an ePDCCH region or in a PDSCH region according to the DCI format indication.
10. The UE of claim 8, wherein the data service acquisition module comprises:
a first data obtaining unit, configured to determine, according to the DCI position information, a position of the DCI information in an ePDCCH region; obtaining PDSCH data after the DCI information in an ePDCCH region; or analyzing the DCI information to obtain the position of PDSCH data in an ePDCCH region;
a second data obtaining unit, configured to determine, according to the DCI position information, a position of the DCI information in an ePDCCH region; and analyzing the DCI information to obtain the position of the PDSCH data in the PDSCH region.
11. A method for sending Physical Downlink Shared Channel (PDSCH) data is characterized by comprising the following steps:
performing downlink pre-allocation scheduling on each user equipment;
an enhanced base station eNB determines that continuous idle resources exist in an enhanced downlink physical control channel (ePDCCH) region of a time slot, and the continuous idle resources can be used as identifiable idle resources of unscheduled user equipment;
the eNB configures DCI information indication in a predetermined enhanced control channel element (eCCE) of a user dedicated search space of the user equipment to indicate that PDSCH data of the user equipment is transmitted in an ePDCCH region and position information of the PDSCH data;
the eNB transmits PDSCH data for the user equipment on the identifiable idle resources of the ePDCCH region.
12. The method of claim 11, wherein the predetermined eCCE of the user-specific search space is a first candidate eCCE of a user-specific search space of AL = 1.
13. The method of claim 11 or 12, wherein the DCI information indication comprises a DCI format indication and DCI location information indicating whether PDSCH data of the user equipment is transmitted in ePDCCH resources and a DCI location of the DCI information of the user equipment, respectively.
14. The method of claim 13, wherein the DCI information indication is transmitted in one eCCE, and/or wherein the DCI indication information is scrambled using a C-RNTI of the user equipment.
15. An enhanced base station (eNB), comprising:
a downlink preallocation scheduling module, which is used for carrying out downlink preallocation scheduling on each user equipment;
an idle resource determination module, configured to determine that continuous idle resources exist in an enhanced downlink physical control channel (ePDCCH) region of a timeslot, where the continuous idle resources may be identifiable idle resources of an unscheduled user equipment;
an information indication configuration module, configured to configure a DCI information indication in a predetermined enhanced control channel element eCCE in a user-specific search space of the user equipment, so as to indicate that PDSCH data of a physical downlink shared channel of the user equipment is transmitted in an ePDCCH region and position information thereof;
a service data transmission module, configured to transmit PDSCH data of the user equipment on the identifiable idle resource in the ePDCCH region.
16. The eNB of claim 15, wherein the predetermined eCCE of the user-specific search space is a first candidate eCCE of a user-specific search space of AL = 1.
17. The eNB of claim 15 or 16, wherein the DCI information indication comprises a DCI format indication and DCI location information indicating whether PDSCH data of the user equipment is transmitted in ePDCCH resources and a DCI location of the DCI information of the user equipment, respectively.
18. The eNB of claim 17, wherein the DCI information indication is transmitted in one eCCE, and/or wherein the DCI indication information is scrambled using a cell radio network temporary identity, C-RNTI, of the user equipment.
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