JP6958590B2 - Random access methods, devices and communication systems that support multiple types of transmission time intervals - Google Patents

Description

The present invention relates to the field of communication technology, and more particularly to a random access method, apparatus and communication system that supports a plurality of types of transmission time intervals (TTI) in an LTE (Long Term Evolution) system.

Real-time traffic such as automatic operation and industrial automatic control appearing in next-generation mobile communication networks has a considerably high demand for transmission latency, for example, a peer-to-peer (P2P) latency must be between 1 ms and 10 ms. These traffic pose a relatively large challenge to network latency performance when carried by LTE systems. Also, with regard to conventional Transmission Control Protocol (TCP) traffic, reducing peer-to-peer latency can significantly improve system throughput. Considering these two aspects, it is urgently necessary to reduce the peer-to-peer latency of traffic in LTE systems.

In ^{3GPP (3 rd Generation Partnership Project)} , a method for reducing the latency of the peer-to-peer by reducing the TTI it has been studied. The TTI adopted by the legacy user equipment (UE, User Equipment) is 1 ms, which is the same as the length of the subframe, that is, the basic time unit for scheduling data is 1 ms. Supporting shortened TTIs (also known as shortened TTIs) in the latest release of UEs can significantly reduce the peer-to-peer latency of traffic, for example, if the TTI is 0.5 ms or shorter. There is. In the conventional system, the round trip time (RTT, Round Trip Time) is 8 TTIs. After the TTI is shortened, the RTT changes from the original 8ms to 4ms, and may even be shorter.

Therefore, LTE cells include a conventional UE (legacy UE) (for example, a UE that adopts a 1 ms TTI) and a UE that has a short TTI (also referred to as a short TTI UE) (shorter TTI UE, for example, than 1 ms. UEs that adopt short TTI) may exist at the same time. The LTE system design must be backwards compatible and ensure that traditional UEs and short TTI UEs work simultaneously without affecting each other.

It should be noted that the above-mentioned introduction of the background technology is for clearly and completely explaining the technical proposal of the present invention and for those skilled in the art to easily understand it. These proposals are described in the background art portion of the present invention and should not be construed as well known to those skilled in the art.

However, the inventor discovered the following. That is, if a plurality of types of TTI user devices perform random access according to a conventional protocol, the base station cannot distinguish which type of TTI user device transmitted the Preamble. In addition, since the user device cannot distinguish the received random access response (RAR, Radom Access Response), it may cause ambiguity or error in RAR reception.

The embodiments of the present invention provide a random access method, apparatus and communication system that support a plurality of types of TTIs, of which a short TTI in which the message in the random access procedure of the user apparatus of the short TTI is shorter than that of the conventional UE TTI. Is allowed to be transmitted by.

According to the first aspect of the embodiment of the present invention, a random access method supporting a plurality of types of TTIs is provided, which is used in a user apparatus, and the random access method is described.
The user equipment sends a preamble to request random access to the base station by the first message, of which the TTI type of the user equipment is indicated by the first message; and the user equipment is the base. It receives a random access response transmitted by a second message from the station, of which different TTI types include corresponding to different said random access responses.

According to the second aspect of the embodiment of the present invention, a random access device supporting a plurality of types of TTIs is provided, which is configured in a user device, wherein the random access device is configured.
A random request transmission unit for transmitting a preamble for requesting random access to the base station by the first message, and the TTI type of the user device is the random request transmission indicated by the first message. Unit; and a random response receiving unit for receiving a random access response transmitted by a second message from the base station, including a random response receiving unit in which different TTI types correspond to the different random access responses. ..

According to the third aspect of the embodiment of the present invention, a random access method supporting a plurality of types of TTIs is provided, which is used for a base station, and the random access method is described.
The base station receives the preamble for requesting random access sent from the user device by the first message, of which the TTI type of the user device is indicated by the first message; and the base station , A second message sends a random access response to the user device, of which different TTI types correspond to different random access responses.

According to the fourth aspect of the embodiment of the present invention, a random access device supporting a plurality of types of TTIs is provided, which is configured in a base station, wherein the random access device is configured.
A random request receiving unit for receiving a preamble for requesting random access transmitted from the user device by the first message, and the TTI type of the user device is indicated by the first message. Random request receiving unit; and a random response transmitting unit for transmitting a random access response to the user device by the second message, wherein different TTI types correspond to different random access responses. including.

According to the fifth aspect of the embodiment of the present invention, a communication system is provided, which supports a plurality of types of TTIs, said communication system.
Including user equipment and base stations
The user device transmits a preamble for requesting random access by the first message, of which the TTI type of the user device is indicated by the first message; and the random transmitted by the second message. Receive an access response and
The base station receives the preamble transmitted from the user apparatus by the first message; and transmits the random access response to the user apparatus by the second message, among which different TTI types. Corresponds to the different random access responses.

According to another aspect of the embodiments of the present invention, a computer-readable program is provided, of which when the program is executed in the user device, the program is sent to the computer as described above in the user device. Execute the random access method.

According to another aspect of the embodiment of the present invention, a storage medium storing a computer-readable program is provided, in which the computer-readable program causes a computer to perform a random access method as described above in a user apparatus. ..

According to another aspect of the embodiments of the present invention, a computer-readable program is provided, of which when the program is executed in the base station, the program is sent to the computer as described above in the base station. Execute the random access method.

According to another aspect of the embodiment of the present invention, a storage medium storing a computer-readable program is provided, in which the computer-readable program causes a computer to perform a random access method as described above in a base station. ..

The beneficial effects of the embodiments of the present invention are as follows, i.e., by indicating the TTI type of the user equipment using the first message to transmit the preamble, the base station can preamble what kind of TTI. It is possible to distinguish whether it was transmitted by the user device of, and the user device can distinguish the received RAR, so that it does not bring about the ambiguity or error of RAR reception. As a result, the latency of the random access procedure of the user device of the short TTI can be significantly reduced.

By referring to the description and drawings described below, a specific embodiment of the present invention will be disclosed in detail, and an embodiment in which the principle of the present invention can be adopted will be shown. The embodiments of the present invention are not limited thereto within the scope. Within the scope of the appended claims, embodiments of the present invention may include various modifications, modifications and alternatives.

Also, the features described and / or shown for one embodiment may be used in one or more other embodiments in the same or similar manner and combined with or in combination with features in other embodiments. It is also possible to replace the features in the morphology.

Note that terms such as "include / have", as used herein, refer to the presence of a feature, element, step, or assemble, but one or more other features, elements, steps, It also refers to not excluding the existence or addition of an assembly.

Many aspects of the invention can be better understood by reference to the drawings below. The elements in the drawings are not drawn proportionally, but merely for showing the principle of the present invention. Also, in order to conveniently explain and illustrate a part of the present invention, the corresponding part in the drawings may be enlarged or reduced.

In addition, the elements and features described in one drawing or embodiment of the present invention can be combined with the elements and features shown in one or more other drawings or embodiments. Further, in the drawings, similar reference numerals may be used to indicate the corresponding elements in some drawings and also to indicate the corresponding elements used in a plurality of embodiments.
It is a figure which shows the random access method which supports a plurality of kinds of TTIs in Example 1 of this invention. It is another figure which shows the random access method which supports a plurality of kinds of TTIs in Example 1 of this invention. It is a figure which shows the preamble which the length in Example 1 of this invention is different from the conventional. It is a figure which shows the preamble which has the same length as the prior art in Example 1 of this invention. It is a figure which shows the grouping of 64 sequences occupied by the UE of a short TTI in Example 1 of this invention. It is a figure which shows the random access method which supports a plurality of kinds of TTIs in Example 2 of this invention. It is a figure which shows the random access apparatus which supports a plurality of kinds of TTIs in Example 3 of this invention. It is another figure which shows the random access apparatus which supports a plurality of kinds of TTIs in Example 3 of this invention. It is a figure which shows the user apparatus in Example 3 of this invention. It is a figure which shows the random access apparatus which supports a plurality of types of TTIs in Example 4 of this invention. It is another figure which shows the random access apparatus which supports a plurality of kinds of TTIs in Example 4 of this invention. It is a figure which shows the base station in Example 4 of this invention. It is a figure which shows the communication system in Example 5 of this invention.

The aforementioned and other features of the present invention will become apparent by reference to the accompanying drawings and the following description. Although the specification and the drawings disclose a specific embodiment of the present invention, it indicates only a partial embodiment in which the principle of the present invention can be adopted, and it should be understood that the present invention is described in this invention. It is not limited to the described embodiments, that is, the invention includes all modifications, modifications and alternatives within the appended claims.

The LTE random access procedure (discussed using conflict-based random access as an example) is primarily in four steps: the UE sends a preamble with message 1 to a base station (eg, eNB). Invokes a random access procedure; the base station sends a RAR with message 2 to provide timing synchronization and an uplink resource grant (UL Grant) for the UE; the UE sends a message 3 to the base station. The ID (identification) is provided to resolve the conflict with other UEs; and the base station includes notifying the UE of successful access by message 4.

In the random access procedure, the RAR is sent from the 3 TTIs after message 1 and message 3 is sent from the 6 TTIs after receiving the RAR. Considering the latency angle, if the UE of the short TTI transmits by adopting the shortened TTI in the above four messages in the random access procedure, the latency of the random access procedure may be significantly reduced.

Taking a UE in a connected state that has lost synchronization as an example, the downlink and uplink latencies of a conventional random access procedure are 13.5 ms and 10.5 ms, respectively. If a random access procedure can employ and transmit 0.5 ms TTI, the latency of the procedure can be reduced to about half of the original value, ie 6.5 ms and 5 ms. This has important implications for reducing latency when a UE that has lost synchronization transmits uplink or downlink data. Therefore, in the random access procedure, it is necessary for UEs supporting a plurality of types of TTIs to access the network at the same time and guarantee compatibility.

All UEs in the cell already know the TTI types supported by the base station from the system information of the cell broadcast (broadcast), and the UEs with short TTIs are already working under one type of short TTI mode. Suppose you have chosen to do so. The random access procedure generated at this time may be from a conventional UE, and there may be UEs with short TTIs (there may be multiple types of UEs with short TTIs, for example, TTI is 0.5 ms. , 0.14ms, etc.).

However, according to the UE behavior specified in the conventional protocol, all the random access channel resources and available preamble sequences used by the preamble sent by the UE in message 1 are for all UEs by the base station. It is a unified configuration. The base station detects a preamble sequence that can appear on the configured resource location, and also performs different RARs based on the time-frequency resource location and sequence characteristics where the detected preamble is located. However, for now, both of these resources and sequences are defined for traditional UEs. The base station cannot distinguish which type of TTI UE the detected preamble is from.

Also, the UE can receive a reachable RAR within one receive window after sending message 1. However, if the random access time frequency resource location and preamble sequence selected by the traditional UE and the short TTI UE are the same, then the RAR scrambling sequence, ie, the Random Access Radio Network Temporary Identifier (RA-RNTI) and its flags. The RAPID fields are exactly the same. If a UE cannot distinguish whether the received RAR is a conventional UE or a short TTI UE, it may cause ambiguity or error in RAR reception.

Therefore, it is necessary to design a unique method for the random access procedure to support UEs of multiple types of TTIs, mainly how to distinguish the TTI types of UEs by preamble, and UEs of different TTI types. Includes a way to distinguish the RARs sent to.

In the present invention, on the one hand, a type of UE that causes random access to the base station so that when the base station transmits RAR, it can be transmitted to the UE of the short TTI under the corresponding short TTI mode. Can be notified as soon as possible. In other words, by carrying the UE TTI type information in message 1, the base station can distinguish which type of UE the preamble was transmitted by. On the other hand, the base station can send different types of RAR messages to different types of UEs and also ensure that the corresponding UEs can receive the corresponding RAR accurately.

Hereinafter, the present invention will be described by taking random access based on conflict as an example, but the present invention is not limited to this, and can be applied to, for example, a non-competitive random access procedure.

The embodiments of the present invention provide a random access method that supports multiple types of TTIs, which are used in user equipment.

FIG. 1 is a diagram showing a random access method that supports a plurality of types of TTIs in an embodiment of the present invention, and shows a situation on the user device side. As shown in FIG. 1, the random access method includes the following steps.

Step 101: The user apparatus sends a preamble to the base station by the first message to request random access, of which the first message indicates the TTI type of the user apparatus;
Step 102: The user equipment receives the RAR transmitted by the second message from the base station, of which different TTI types correspond to different RARs.

FIG. 2 is another diagram showing a random access method that supports a plurality of types of TTIs in an embodiment of the present invention, and alternates (interacts) between a user device and a base station when adopting a conflict-based random access procedure. Shows the situation. As shown in FIG. 2, the random access method includes the following steps.

Step 201: The first message sends a preamble to the base station to request random access, of which the first message indicates the TTI type of the user device;
Step 202: The base station sends a RAR to the user equipment with a second message, of which different TTI types correspond to different RARs.

As shown in FIG. 2, as an option, the random access method may further include the following steps.

Step 203: The user device sends a user device identifier (ID) to the base station by a third message for conflict resolution;
Step 204: The base station transmits the conflict result information to the user apparatus by the fourth message.

In this embodiment, the user device includes a first user device that uses the first TTI type and a second user device that uses the second TTI type, among which the first TTI type and the second TTI type are used. The corresponding TTIs are different and less than 1ms.

Among them, the first user device may be one or more user devices using the first TTI type, and the second user device may be one or more ones using the second TTI type. It may be a type of user device. Base stations unify resources for certain types of user equipment.

Hereinafter, the first user device is a 1 ms TTI user device (that is, a conventional UE), and the second user device is a TTI user device (for example, 0.5 ms) smaller than 1 ms (that is, a short TTI UE). The explanation will be given by taking the above as an example. Among them, there may be multiple types of short TTI UEs.

When the user device initiates random access, it sends one preamble as the first message (message 1) on one available resource, and the base station sends the preamble over the time frequency resources of all preambles. Detect and receive. The TTI type of the user device can be distinguished by the resources used by the preamble, and can also be distinguished by the format or content of the preamble.

In one implementation method (ie, implementation method 1.1), a plurality of types of TTIs may be distinguished by the resources occupied by the preamble. The resource may include one or any combination of time domain resources, frequency domain resources and sequence resources.

Specifically, the UE selects available time domain resources, available frequency domain resources, and selectable ZC (Zadoff-Chu) sequences (64 in total) configured by the base station. Send the preamble. Thus, three methods can be used to distinguish between preambles of UEs of different TTI types, ie, allocate exclusive time domain resources for UEs of short TTI; for UEs of short TTI. Allocate exclusive frequency domain resources to; Allocate exclusive ZC sequences for short TTI UEs. Any one of these three methods may be used, or a plurality of types of methods may be used in combination at the same time.

<Implementation method 1.1.1>
The time domain resource from which the first user device transmits the preamble and the time domain resource from which the second user device transmits the preamble are different and orthogonal to each other.

For example, the first user device uses the first time domain resource table, and the second user device uses the second time domain resource table. In the first time domain resource table and the second time domain resource table, the same physical random access channel (PRACH) configuration index (Configuration Index) corresponds to a different subframe number. do.

Specifically, traditional UEs determine the available subframe sequence numbers in Table 5.7.1-2 in the TS 36.211 protocol, ie time domain resources, based on the parameter prach-ConfigIndex configured by the base station. Look up.

Table 1 is a time domain resource table used by traditional UEs (same as Table 5.7.1-2 in TS 36.211).

To distinguish them from traditional UEs, the time domain resources (ie, subframe sequence numbers) used by the short TTI UEs are mutually exclusive with the time domain resources available to the corresponding legacy UEs under the same prach-ConfigIndex. Should be orthogonal. In other words, the base station configures the same prach-ConfigIndex for all UEs, but the set of available subframe sequence numbers indicated by traditional UEs and short TTI UEs is quite different (ie, common). There is no set).

One implementation may define one new time domain resource table, which corresponds in parallel with Table 5.7.1-2 in the TS 36.211 protocol, for example, as shown in Table 2. The short TTI UE does a lookup only in Table 2 when selecting the time domain resource to send the preamble. The specific contents of the table are not limited to Table 2, and it is sufficient that the conditions orthogonal to the conventional UE lookup table can be satisfied. Similarly, the implementation method is not limited to the method of constructing its own time domain resource table, so that the time domain resource selected by the UE of the short TTI and the time domain resource selected by the conventional UE are orthogonal to each other. Any method that can be made belongs to the scope of the present invention.

Table 2 is a time domain resource table (newly defined in the present invention) used by the short TTI UE.

Note that Table 2 shows only the case where the present invention adopts the time domain resource to distinguish the preamble, but the present invention is not limited to this, and for example, the specific contents of Table 2 are appropriately described. You may adjust it.

<Implementation method 1.1.2>
The frequency domain resource from which the first user device transmits the preamble and the frequency domain resource from which the second user device transmits the preamble are different and orthogonal to each other.

For example, the first user device uses the first parameter to select a frequency domain resource to transmit the preamble, and the second user device uses the second parameter to select a frequency domain resource to transmit the preamble. Select.

Specifically, the conventional UE selects a frequency domain resource for transmitting a preamble based on the parameter prach-FreqOffset (first parameter) configured by the base station. If the system bandwidth is greater than 1.4 MHz, new frequency domain resources can be added for short TTI UEs, which are orthogonal to the frequency domain resources used by traditional UEs.

The base station added a new parameter prach-FreqOffset-shorterTTI (second parameter) in the parameter PRACH-Config to indicate the frequency domain used by the UE of the short TTI, with a parameter range of, for example, 0-94. Is. Conventional UEs may ignore the parameter prach-FreqOffset-shorterTTI.

<Implementation method 1.1.3>
The ZC sequence in the preamble transmitted by the first user device and the ZC sequence in the preamble transmitted by the second user device are different.

For example, the first part of the 64 ZC sequences corresponds to the first user device, and the second part of the 64 ZC sequences corresponds to the second user device.

Specifically, the conventional UE transmits one of the 64 ZC sequences as a preamble based on the parameters configured by the base station. Except for the sequence for non-competitive random access, the numberOfRA-Preambles sequence is used by the conventional UE, of which the sizeOfRA-PreamblesGroupA sequence belongs to GroupA and the rest is GroupB.

If a traditional UE and a short TTI UE are present in the cell at the same time, the base station adds new parameters to represent the ZC sequences that the short TTI UE can use, and these sequences are added by the traditional UE. It should belong to a part other than the available sequences.

For example, the parameter numberOfRA-Preambles-TTItype1 is defined for the UE of the first type of short TTI, and the sizeOfRA-PreamblesGroupA-TTItype1 is defined; for the UE of the second type of short TTI, the parameter numberOfRA- Define Preambles-TTI type2 and define sizeOfRA-PreamblesGroupA-TTItype2. Similarly, for more types of short TTI UEs, multiple groups of parameters may be defined to define the range of ZC sequences to use.

This ensures that the ZC sequences used do not overlap each other between traditional UEs and UEs of different types of TTIs. For example, the first numberOfRA-Preambles sequence out of 64 sequences is used by the conventional UE, and the subsequent numberOfRA-Preambles-TTItype 1 sequence is used by the UE of the first type short TTI. The subsequent sequence of two numberOfRA-Preambles-TTItypes is used by the UE of the second type of short TTI. The front part of the ZC sequence used by the UE of each type of TTI is defined to belong to GroupA, and its size is defined by the parameters sizeOfRA-PreamblesGroupA-TTItype1, sizeOfRA-PreamblesGroupA-TTItype2, etc. NS. Also, the latter part of the sequence used by this type of UE belongs to Group B.

In another embodiment (ie, embodiment 1.2), a plurality of types of TTIs can be distinguished by the format or content of the preamble.

Specifically, the traditional UE looks up the preamble formats to be used in Table 5.7.1-2 in the TS 36.211 protocol based on the base station configured prach-ConfigIndex, which are format0, format1, Includes format2, format3, etc. The new preamble format can be distinguished from traditional UEs by designing it exclusively for short TTI UEs. The new format should have a very good cross-correlation with the conventional preamble, and the conventional format and the new format can be transmitted at the same time with very little interference with each other. Of these, the preamble lengths of the new format and the old format do not necessarily have to be the same. The specific design of the new preamble format does not belong to the scope of the present invention, and the random access methods corresponding to the different formats are defined below by taking the features of the three new formats as examples.

<Implementation method 1.2.1>
The length of the preamble adopted by the first user device is different from the length of the preamble adopted by the second user device.

Among them, the length of the preamble adopted by the first user device is 1 ms, 2 ms or 3 ms, the length of the preamble adopted by the second user device is 0.5 ms, and the length of the preamble adopted by the second user device is 0.5 ms. Randomly selects one of a plurality of available time slots and transmits the preamble.

Specifically, there is one new format format5 dedicated to the short TTI UE, and the cross-correlation with the conventional formats format0, format1, format2, and format3 is very good, and the existing interference is very high. Suppose it is small. The time length occupied by format5 is 0.5 ms, of which the cyclic prefix (CP, Cyclic Prefix), guard time (GT, Guard Time), and ZC sequence length are not limited.

FIG. 3 is a diagram showing a preamble whose length in the embodiment of the present invention is different from that of the conventional format. As shown in FIG. 3, the time length occupied by format 5 is 0.5 ms. Note that FIG. 3 shows only a new format whose format is different from the conventional preamble format, but the present invention is not limited to this, and for example, a format having another length may be used.

Short TTI UEs all adopt format5, regardless of what type of format the base station is composed of (eg, format0, format1, format2 or format3). And send the preamble. Based on the base station configuration, the short TTI UE selects one starting subframe. Randomly select one 0.5 ms time slot from multiple available time slot resources based on the situation where the preamble configured by the base station should occupy the number of subframes (ie, the acquired time domain resource). Select to send a preamble.

Situation 1: If the base station is configured with format0 (1ms long, i.e. two time slots), the UE will be out of the two time slots after the start subframe. Randomly select one time slot and send;
Situation 2: If the base station consists of formats 1 and 2 (2 ms in length, i.e. 4 time slots), the UE will have 4 time slots after the start subframe. Randomly select one of the time slots and send it;
Situation 3: If the base station is composed of format3 (3ms long, i.e. 6 time slots), the UE will be out of the 6 time slots after the start subframe. One time slot is randomly selected and transmitted.

In this embodiment, the resources used by the UE to transmit the preamble follow the configuration of the base station. The UE records the number of time slots it selects and sends, and writes it as s_id (0 <s_id ≤ 6), that is, s_id is a time domain resource that the UE with a short TTI can select. Indicates the position of the time slot for transmitting the preamble in. The value of the s_id is used in the calculation of RA-RNTI described later.

<Implementation method 1.2.2>
The length of the preamble adopted by the first user device and the length of the preamble adopted by the second user device are the same, but the formats are different.

For example, some new formats dedicated to short TTI UEs, format0a (length 1ms, corresponding to format0), format1a (length 2ms, corresponding to format1), format2a (length 2ms, corresponding to format1). There is (corresponding to format2), format3a (length is 3ms and corresponds to format3), and there is a great deal of cross-correlation with the corresponding conventional formats format0, format1, format2, format3. Well, suppose the interference present is very small. The time length occupied by the new format is the same as the corresponding conventional format, and the length of the CP, GT, and ZC sequences is not limited.

FIG. 4 is a diagram showing a preamble having the same length as the conventional format in the embodiment of the present invention. As shown in FIG. 4, the time length occupied by format0a, format1a, format2a, and format3a is the same as format0, format1, format2, and format3, respectively, but the contents (for example, CP, GT, and ZC lengths). Is different.

The short TTI UE selects the corresponding new format based on the preamble format specified in the prach-ConfigIndex parameter configured by the base station. That is, if the conventional UE selects format0, the short TTI UE selects format0a, and if the conventional UE selects format1, the short TTI UE selects format1a and makes an analogy based on this. be able to. The resources that the UE uses to send preambles follow the base station configuration. The UE then records s_id = 1, which is used in the RA-RNTI calculation described below.

<Implementation method 1.2.3>
The ZC sequence in the preamble adopted by the first user device is different from the ZC sequence in the preamble adopted by the second user device, of which the first user corresponds to 64 first ZC sequences. do. It also generates 64 different second ZC sequences for the second user device.

Specifically, based on the rootSequenceIndex parameter configured by radio resource control (RRC) messages, we first use the root sequence to generate 64 sequences for a traditional UE, then 64. If less than, according to the order of the route sequences defined in TS 36.211 Table 5.7.2-4, one of the following route sequences is used to generate more ZC sequences until the number reaches 64, and the sequence number index Is 0 to 63.

In this embodiment, after the 64 ZC sequences (first ZC sequence) generated for the conventional UE, 64 ZC sequences (second ZC sequence) are further followed by another route sequence according to the order of the route sequence. The ZC sequence) is generated so that the UE of the short TTI is dedicated, and its sequence number (preamble index) is also 0 to 63, which is the same as that of the conventional UE. That is, the sequence numbers 0 to 63 correspond to one conventional sequence (first ZC sequence) and one new sequence (second ZC sequence). The generated 128 ZC sequences are known to the base station and the UE. Also, the cross-correlation between these 128 ZC sequences is very good.

The short TTI UE selects the appropriate preamble format based on the base station configuration and uses the same format as the conventional UE, but the transmission sequence is 64 sequences dedicated to the short TTI UE. To use. The resources used to transmit the preamble follow the configuration of the base station. At this time, the UE records s_id = 1 for calculating RA-RNTI, which will be described later.

In this embodiment, ZC sequences may be further grouped for short TTI UEs, which can be applied to all embodiments other than the aforementioned embodiment 1.1.3 of the present invention. .. A short TTI UE has 64 ZCs when it is possible to distinguish between a traditional UE and a short TTI UE (independent of ZC sequence grouping) in two ways: time-frequency resources and preamble format. The sequence can be occupied. Grouping for short TTI UEs does not affect the grouping for traditional UEs and they are independent of each other.

These 64 sequences, which are occupied by UEs with short TTIs, need to be used for UEs with short TTIs of different lengths. Here, it is assumed that the non-conflict-based sequence is shared by the conventional UE and the UE of short TTI. Grouping classifies Group A and Group B sequences of each type for UEs of different TTI types (eg 0.5ms, 0.1ms, etc.).

For example, for a UE of short TTI type 1, parameters numberOfRA-Preambles-TTItype1, sizeOfRA-PreamblesGroupA-TTItype1 are defined, and for a UE of short TTI type 2, parameters numberOfRA-Preambles-TTItype2, sizeOfRA-PreamblesGroupA-TTItype2 And based on this, parameters are defined for each particular short TTI type, thereby limiting the sequence range available to UEs of that type. Among them, numberOfRA-Preambles-TTItypei indicates the number of ZC sequences that can be used by the UE of the i-type short TTI, and sizeOfRA-PreamblesGroupA-TTItypei is the sequence that can be used by the UE of the i-type short TTI. , Indicates the number of sequences belonging to that Group A, and the remaining sequences belong to Group B.

FIG. 5 is a diagram showing grouping for 64 sequences occupied by UEs of short TTIs in the embodiments of the present invention. As shown in FIG. 5, UEs of the first type short TTI can use sequences with sequence numbers between 0 and numberOfRA-Preambles-TTItype1-1, of which the previous sizeOfRA-PreamblesGroupA-TTItype1 The sequences belong to Group A, the remaining sequences belong to Group B, and the UEs of the second type of short TTI have sequence numbers from numberOfRA-Preambles-TTI type1 to numberOfRA-Preambles-TTItype1 + numberOfRA-Preambles-TTItype2-1. You can use the sequences up to, of which the previous two sizeOfRA-PreamblesGroupA-TTItype sequences belong to GroupA and the rest are GroupB, which can be inferred.

In this embodiment, when the user device fails to transmit the first message indicating the TTI type, the user device may further transmit the first message not indicating the TTI type.

For example, if a short TTI UE sends a preamble according to the method described above to notify the base station of its TTI type and all multiple attempts fail, the short TTI UE will use the traditional UE transmission method. The preamble should be sent according to. The relevant TTI type information may be carried by subsequent signaling (eg, carry the TTI type information in message 3), and during this period transmission is performed using the conventional TTI.

Although step 101 or 201 has been exemplified above, step 102 or 202 will be described below.

In this embodiment, the user apparatus monitors the physical downlink control channel (PDCCH) scrambled by RA-RNTI when the three TTIs after transmitting the preamble are completed. Begin to.

For example, after sending a preamble, the UE monitors the PDCCH scrambled by RA-RNTI within the “RAR time window” and receives the RAR corresponding to its RA-RNTI. If the RAR sent by the base station cannot be received within this RAR time window, it means that this random access procedure has failed.

For traditional UEs, the RAR time window is (starts) from the three subframes after the subframe that sends the preamble. For short TTI UEs, the RAR time window is from 3 TTIs after sending the preamble (for example, for 0.5ms TTI, you may start receiving RAR after 1.5ms). , Ra-ResponseWindowSize Lasts for the length of TTI.

In the embodiment 1.1, both the first user device and the second user device can correspond to the first RA-RNTI (that is, the conventional RA-RNTI). In the first user device, the first user device corresponds to the first RA-RNTI, and the first RA-RNTI is determined by the time domain resource and the frequency domain resource for transmitting the preamble, and the second user device is determined. Corresponds to the second RA-RNTI, which is different from the first RA-RNTI.

For example, the traditional way the UE calculates RA-RNTI is RA-RNTI = 1 + t_id + 10 * f_id, of which t_id is the first of the random access channel resources the UE has chosen to send the preamble. The third subframe sequence number (0 ≤ t_id <10), where f_id is the frequency domain (0 ≤ f_id <6) of the random access channel selected by the UE to transmit the preamble. RA-RNTI is used to distinguish the RARs corresponding to UEs sending preambles using different time frequency resources.

In this embodiment, when the conventional UE and the UE of the short TTI use the same preamble resource, and the same ZC sequence or the same ZC sequence sequence number (for Example 1.2.3, the sequence number index is 64 at maximum. However, there are 128 ZC sequences), and RA-RNTI can distinguish between RARs corresponding to conventional UEs and UEs with short TTIs.

Thus, the embodiments of the present invention define one new RA-RNTI calculation method for short TTI UEs. The RA-RNTI corresponding to the UE of the short TTI may relate not only to the time domain resource and the frequency domain resource for transmitting the preamble, but also to the time slot position for transmitting the preamble.

In this embodiment, the value of the second RA-RNTI may be the value obtained by adding a positive integer multiple of 60 to the value of the first RA-RNTI.

For example, a short TTI UE calculates RA-RNTI using the following method, i.e. RA-RNTI = 1 + t_id + 10 * f_id + 60 * s_id. Among them, the default value of s_id is 1, and as described above, s_id indicates the time slot position where the UE of the short TTI sends the preamble in the selectable time domain resource. The conventional RA-RNTI calculation formula may be regarded as a special case when s_id = 0.

Although the calculation method of RA-RNTI has been described above by way of example, the present invention is not limited thereto. The above calculation formula may be adjusted appropriately according to the actual situation. The numerical ranges of the new RA-RNTI and the conventional RA-RNTI may be different, as long as there is no intersection.

In this embodiment, the base station can know the TTI type of the UE that transmits the preamble by the message 1, or the base station can know the TTI type of the UE by other methods such as the core network. Yes, the base station should send a corresponding RAR for different types of UEs. For example, the base station scrambles the RAR of the first user device into the PDCCH using the first RA-RNTI and the RAR of the second user device into the PDCCH using the second RA-RNTI. Scramble against it. Each user device may descramble the PDCCH based on its own RA-RNTI. The present invention is not limited to this, and the base station may scramble each user device using the first RA-RNTI, and the specific contents thereof refer to Example 2. be able to.

In addition, the base station may not know the TTI type of the UE that transmits the preamble. In such a case, the base station performs a plurality of RARs corresponding to the plurality of types of TTIs for one received preamble. You may send it. For example, for each detected preamble, send two RARs (for a traditional UE and a 0.5ms TTI UE, respectively).

The user device can obtain RAR by the following method. The first user device descrambles the PDCCH using the first RA-RNTI, the second user device descrambles the PDCCH using the second RA-RNTI, and further the PDCCH. Decoding may be performed for the physical downlink shared channel (PDSCH, physical downlink shared channel) based on the instruction of.

For example, when the base station transmits two RARs to one received preamble, the UE can accurately receive the RAR corresponding to itself by the following two types of methods.

Method 1: The conventional UE adopts the conventional RA-RNTI calculation method, and the short TTI UE adopts the RA-RNTI calculation method newly defined in the present invention. The base station scrambles the RAR using different RA-RNTIs. The UE can distinguish between the RAR of a conventional UE and the RAR of a short TTI UE when descramble the PDCCH using RA-RNTI.

Method 2: The UE receives all RARs in the RAR time window and decrypts the PDSCH channel according to its TTI type. If what is sent is not a RAR that corresponds to your TTI type, it means that the data is incorrect and you discard the RAR, otherwise the RAR corresponds to your TTI type. Consider it as.

In step 103 and step 104, the following operations may be further performed.

The user apparatus transmits the third message to the base station when the six TTIs after receiving the RAR are completed. For example, a conventional UE can send message 3 (Msg3) in the 6th subframe after receiving RAR, while a short TTI UE can send message 3 (Msg3) after receiving RAR. Message 3 should be sent after the eye TTI.

Once message 3 is sent, the UE should activate one conflict resolution timer, mac-ContentionResolutionTimer, whose numerical value is configured by the base station. For conventional UEs, the unit of numerical value for the timer is subframe, but for UEs with short TTI, the unit of numerical value for the timer is TTI (0.5 ms or shorter).

Since the subsequent operation of the random access procedure is similar to the conventional random access procedure, detailed description thereof will be omitted here.

As can be seen from the above embodiment, by indicating the TTI type of the user equipment using the first message for transmitting the preamble, the base station distinguishes which type of TTI user equipment the preamble was transmitted by. And since the user device can distinguish the received RAR, it does not cause ambiguity or error of RAR reception. As a result, the latency of the random access procedure of the user device of the short TTI can be significantly reduced.

The embodiments of the present invention provide a random access method that supports multiple types of TTIs, which are used in base stations. The contents of the examples of the present invention that are the same as those of the first embodiment are omitted.

FIG. 6 is a diagram showing a random access method that supports a plurality of types of TTIs in the embodiment of the present invention, and shows the situation on the base station side. As shown in FIG. 6, the random access method includes the following steps.

Step 601: The base station receives the preamble for requesting random access sent from the user device by the first message, of which the TTI type of the user device is indicated by the first message. ;
Step 602: The base station sends a RAR to the user device by a second message, of which different TTI types correspond to different RARs.

In this embodiment, it may be a conflict-based random access procedure, and the random access method further comprises a base station receiving a user device identifier transmitted by the user device using a third message, and , The base station may include transmitting conflict result information to the user apparatus by the fourth message. The present invention is not limited to this, and can be applied to other types of random access procedures.

In this embodiment, the base station detects a preamble that can exist on the configured time-frequency resource location, and responds to the detected preamble, that is, performs RAR. Among them, the base station can transmit the RAR to the user device in the PDCCH scrambled by the RA-RNTI when the three TTIs after receiving the preamble are completed.

In this embodiment, the user device may include a first user device that uses the first TTI type and a second user device that uses the second TTI type, among which the first TTI type and the second TTI. The TTIs corresponding to the types are different and less than 1 ms.

In the case of the above-described embodiment 1.1, both the first user device and the second user device can correspond to the conventional RNTI (that is, the first RA-RNTI). In the case of the above-described embodiment 1.2, the first user apparatus can correspond to the first RA-RNTI, and the first RA-RNTI is determined by the time domain resource and the frequency domain resource for transmitting the preamble. , The second user apparatus can correspond to a second RA-RNTI different from the first RA-RNTI. Example 1 can be referred to for the specific realization of the above contents.

Hereinafter, the related operations of the base station will be described separately for two cases.

<Implementation method 2.1>
If the base station knows the TTI type of the UE that sends the preamble by message 1, or if the base station can know the TTI type of the UE by other methods such as the core network, the base station is different. A corresponding RAR should be sent to the type UE.

[In case of implementation method 1.1]
Since the base station knows the configured time-frequency resources and the ZC sequence grouping status, it determines the UE type corresponding to the preamble based on the position of the time-frequency resource that detected the preamble and the ZC sequence. And different RARs can be sent. At this time, the conventional RA-RNTI (that is, the first RA-RNTI) calculation method is adopted.

[For implementation method 1.2]
For embodiment 1.2.1, the base station first detects the conventional preamble format and then the format format5, which detects possible preambles from the conventional UE and the short TTI UE, respectively. , And send a different RAR. At this time, the RA-RNTI (that is, the second RA-RNTI) calculation method newly defined in the present invention is adopted.

For method 1.2.2 and method 1.2.3, the base station employs conventional preamble format detection to simultaneously detect possible preambles from conventional UEs and short TTI UEs, and different RARs. Can be sent. At this time, the RA-RNTI (that is, the second RA-RNTI) calculation method newly defined in the present invention is adopted.

After detecting the preamble, the base station can send RAR after 3 TTIs to the detected UE (3ms for traditional UEs and less time for short TTI UEs). be).

In this example, the Random Access Preamble IDentifier (RAPID) field in the RAR indicates the sequence number of the ZC sequence, the value of which is 0 to 63, and the new 64 ZC sequences are conventional. Share these 64 sequence numbers with the 64 ZC sequences of. The Uplink Grant (UL Grant) field is the resource location scheduled for the UE, and the UL Grant in the RAR sent to the UE for the short TTI is scheduled according to the shortened TTI. The Backoff Indicator (BI) field indicates the backoff time of the UE and should be configured with a relatively small value for UEs with a short TTI.

<Implementation method 2.2>
If the base station cannot know the TTI type of the UE sending the preamble by message 1, the base station will have two RARs for each detected preamble (for a conventional UE and a UE with a TTI of 0.5 ms, respectively). Can be sent). The present invention is not limited to this, and for example, more RAR may be transmitted.

The base station may share some (or all) time frequency resources and ZC sequence resources with conventional UEs and short TTI UEs. After detecting a preamble on such a resource, the base station considers that a conventional UE and a short TTI UE that transmit the preamble may exist at the same time. Base stations simultaneously allocate UL Grants for traditional UEs and short TTI UEs, one of which resources can be wasted.

For example, when the base station transmits two RARs to one received preamble, the UE can accurately receive the RAR corresponding to itself by the following two types of methods.

Method 1: The conventional UE adopts the conventional RA-RNTI (first RA-RNTI) calculation method, and the short TTI UE adopts the RA-RNTI (second RA-RNTI) calculation newly defined in the present invention. Adopt the method. The base station scrambles the RAR using different RA-RNTIs. The UE can use RA-RNTI to distinguish between the RAR of a conventional UE and the RAR of a short TTI UE when descrambled a PDCCH.

Method 2: The UE receives all RARs in the RAR time window and decodes (decodes) the PDSCH channel based on its TTI type. If what is sent is not a RAR that corresponds to your TTI type, it means that the data is incorrect and you discard the RAR, otherwise the RAR corresponds to your TTI type. Consider as.

As can be seen from the above embodiment, by indicating the TTI type of the user equipment using the first message for transmitting the preamble, the base station distinguishes which type of TTI user equipment the preamble was transmitted by. And the user device can distinguish the received RAR, so that it does not cause ambiguity or error in RAR reception. As a result, the latency of the random access procedure of the user device of the short TTI can be significantly reduced.

An embodiment of the present invention provides a random access device that supports multiple types of TTIs, which are configured in a user device. Since the examples of the present invention correspond to the random access method of the first embodiment, the same contents are omitted.

FIG. 7 is a diagram showing a random access device that supports a plurality of types of TTIs in an embodiment of the present invention. As shown in FIG. 7, the random access device 700 includes the following.

Random request transmission unit 701: By the first message, a preamble for requesting random access is transmitted to the base station, in which the TTI type of the user device is indicated by the first message;
Random response receiving unit 702: The base station receives the RAR transmitted by the second message, of which different TTI types correspond to different RARs.

FIG. 8 is another diagram showing a random access device that supports a plurality of types of TTIs in an embodiment of the present invention. As shown in FIG. 8, the random access device 800 includes a random request transmitting unit 701 and a random response receiving unit 702 as described above.

Further, as shown in FIG. 8, the random access device 800 may further include the following.

Identifier transmission unit 801: The user device identifier is transmitted to the base station due to a conflict by a third message;
Result receiving unit 802: Receives the conflict result information transmitted by the base station by the fourth message.

In this embodiment, the user device includes a first user device that uses the first TTI type and a second user device that uses the second TTI type, among which the first TTI type and the second TTI type are used. The corresponding TTIs are different and less than 1ms.

In one embodiment, the resources occupied by the preamble distinguish between multiple TTI types, the resource including one or any combination of time domain resources, frequency domain resources and sequence resources.

For example, the time domain resource of the preamble transmitted by the first user device and the time domain resource of the preamble transmitted by the second user device are different and orthogonal to each other. Among them, the first user device uses the first time domain resource table, the second user device uses the second time domain resource table, and the first time domain resource table and the second time domain resource. In the table, the same physical random access channel configuration index corresponds to a different subframe sequence number.

Further, for example, the frequency domain resource of the preamble transmitted by the first user apparatus and the frequency domain resource of the preamble transmitted by the second user apparatus are different from each other and are orthogonal to each other. Among them, the first user apparatus uses the first parameter to select a frequency domain resource for transmitting the preamble, and the second user apparatus uses the second parameter to select the frequency domain resource for transmitting the preamble. Select an area resource.

Further, for example, the ZC sequence in the preamble transmitted by the first user device and the ZC sequence in the preamble transmitted by the second user device are different from each other, and among them, the first part in the 64 ZC sequences. Corresponds to the first user device, and the second portion of the 64 ZC sequences corresponds to the second user device.

In another embodiment, a plurality of TTI types are distinguished by the format or content of the preamble.

For example, the length of the preamble adopted by the first user device and the length of the preamble adopted by the second user device are different, and the length of the preamble adopted by the first user device is 1 ms or 2 ms. Or 3 ms, the length of the preamble adopted by the second user device is 0.5 ms, and the second user device randomly selects one time slot among a plurality of available time slots. The preamble is transmitted.

Further, for example, the length of the preamble adopted by the first user device and the length of the preamble adopted by the second user device are the same, but the formats are different.

Further, for example, the ZC sequence in the preamble adopted by the first user device and the ZC sequence in the preamble adopted by the second user device are different, of which the first user device has 64th numbers. Corresponds to one ZC sequence. It also generates 64 different second ZC sequences for the second user device.

In this embodiment, when the random request transmission unit 701 fails to transmit the first message instructing the TTI type, the random request transmission unit 701 may further transmit the first message instructing the TTI type.

In this embodiment, the random response receiving unit 702 begins monitoring the PDCCH scrambled by the RA-RNTI when the three TTIs after the random request transmitting unit 701 transmit the preamble ends.

The identifier transmission unit 801 transmits the third message to the base station when the six TTIs after receiving the random access response are completed.

In this embodiment, in the case of the above-described embodiment 1.1, both the first user device and the second user device can correspond to the first RA-RNTI. Both the first user device and the second user device can scramble the PDCCH using the first RA-RNTI.

In the case of the above-described embodiment 1.2, the first user apparatus can correspond to the first RA-RNTI, and the first RA-RNTI is determined by the time domain resource and the frequency domain resource for transmitting the preamble. , The second user apparatus can correspond to a second RA-RNTI different from the first RA-RNTI. The first user device can scramble the PDCCH using the first RA-RNTI, and the second user device can scramble the PDCCH using the second RA-RNTI. It can be performed. Further, decoding may be performed on PDSCH based on the instruction of PDCCH.

An embodiment of the present invention further provides a user device, in which a random access device 700 or 800 as described above is configured.

FIG. 9 is a diagram showing a user device according to an embodiment of the present invention. As shown in FIG. 9, the user device 900 includes a central processing unit 100 and a storage device 140, and the storage device 140 is connected to the central processing unit 100. It should be noted that the figure is merely an example, and the structure may be supplemented or substituted with a structure of another type to realize a telecommunications function or another function.

In one embodiment, the functionality of the random access device 700 or 800 may be integrated into the central processing unit 100. Among them, the central processing unit 100 may be configured to realize a random access method that supports a plurality of types of TTIs as described in the first embodiment.

In another embodiment, the random access device 700 or 800 may be configured separately from the central processing unit 100, eg, the random access device 700 or 800 is configured as a chip connected to the central processing unit 100. , The function of the random access device 700 or 800 may be realized by controlling the central processing unit.

As shown in FIG. 9, the user device 900 may further include a communication module 110, an input unit 120, a voice processor 130, a storage device 140, a camera 150, a display 160, and a power supply 170. Among them, since the functions of these parts are similar to those of the prior art, detailed description thereof will be omitted here. The user device 900 does not necessarily have to include all the parts shown in FIG. Further, the user device 900 may further include a device not shown in FIG. 9, for which prior art can be referred to.

As can be seen from the above embodiment, by indicating the TTI type of the user equipment using the first message for transmitting the preamble, the base station distinguishes which type of TTI user equipment the preamble was transmitted by. And since the user device can distinguish the received RAR, it does not cause ambiguity or error of RAR reception. As a result, the latency of the random access procedure of the TTI user device can be significantly reduced.

An embodiment of the present invention provides a random access device that supports multiple types of TTIs, which are configured in a base station. Examples of the present invention correspond to the random access method of Example 2, and the same contents are omitted.

FIG. 10 is a diagram showing a random access device that supports a plurality of types of TTIs in an embodiment of the present invention. As shown in FIG. 10, the random access device 1000 includes the following.

Random Request Receiving Unit 1001: The first message receives a preamble sent by the user device to request random access, of which the first message indicates the TTI type of the user device;
Random response transmission unit 1002: A second message transmits a RAR to the user device, of which different TTI types correspond to different RARs.

FIG. 11 is another diagram showing a random access device that supports a plurality of types of TTIs in an embodiment of the present invention. As shown in FIG. 11, the random access device 1100 includes a random request receiving unit 1001 and a random response transmitting unit 1002 as described above.

Further, as shown in FIG. 11, the random access device 1100 may further include the following.

Identifier receiving unit 1101: Receives the user device identifier transmitted by the user device by the third message; and result transmitting unit 1102: transmits the conflict result information to the user device by the fourth message.

In this embodiment, the random response transmitting unit 1002 performs the RAR by a PDCCH scrambled by RA-RNTI when the three TTIs after the random request receiving unit 1001 receives the preamble ends. , Sent to the user device.

In the present embodiment, the user device may include a first user device using the first TTI type and a second user device using the second TTI type, among which the first TTI type and the second TTI type are used. The corresponding TTIs are different and less than 1ms.

In this embodiment, in the case of the above-described embodiment 1.1, both the first user device and the second user device can correspond to the first RA-RNTI. In the case of the above-described embodiment 1.2, the first user apparatus can correspond to the first RA-RNTI, and the first RA-RNTI is determined by the time domain resource and the frequency domain resource for transmitting the preamble. , The second user apparatus can correspond to a second RA-RNTI different from the first RA-RNTI.

In this embodiment, the random response transmission unit 1002 can further transmit a plurality of RARs corresponding to the plurality of types of TTIs to one received preamble.

The embodiments of the present invention further provide a base station, in which the random access devices 1000 or 1100 as described above are configured.

FIG. 12 is a block diagram of a base station according to an embodiment of the present invention. As shown in FIG. 12, the base station 1200 may include a central processing unit (CPU) 200 and a storage device 210, which is connected to the central processing unit 200. Among them, the storage device 210 can store various types of data, can further store a program for information processing, and can execute the program under the control of the central processing unit 200. can.

Among them, the functions of the random access device 1000 or 1100 can be integrated into the central processing unit 200. The central processing unit 200 may be configured to implement a random access method that supports multiple types of TTIs as described in Example 2.

Further, as shown in FIG. 12, the base station 1200 may further include a transceiver 220, an antenna 230, and the like, and the functions of these components are similar to those of the prior art. Omit. The base station 1200 does not necessarily include all of the ones in FIG. Further, the base station 1200 may further include one not shown in FIG. 12, for which prior art can be referred to.

As can be seen from the above embodiment, by indicating the TTI type of the user equipment using the first message for transmitting the preamble, the base station can determine which type of TTI type user equipment the preamble was transmitted by. Since it is possible to distinguish and the user device can distinguish the received RAR, it does not cause ambiguity or error in RAR reception. As a result, the latency of the random access procedure of the user device of the short TTI can be significantly reduced.

The embodiments of the present invention further provide a communication system, which can support multiple types of TTIs. The contents of the examples of the present invention that are the same as those of Examples 1 to 4 are omitted.

FIG. 13 is a diagram showing a communication system according to an embodiment of the present invention. As shown in FIG. 13, the communication system 1300 includes a base station 1301 and a user device 1302.

Among them, the user apparatus 1302 transmits a preamble for requesting random access by the first message, and among them, the TTI type of the user apparatus 1302 is indicated by the first message, and the base station 1301 is described as described above. The first message receives the preamble transmitted by the user device 1302, and the base station 1301 transmits a RAR to the user device 1302 by the second message, of which different TTI types are sent to different RARs. Correspondingly, the user device 1302 receives the RAR transmitted by the second message.

An embodiment of the present invention provides a computer-readable program, of which, when the program is executed in a user device, the program tells the computer the plurality of types of TTIs described in Example 1 in the user device. Run a random access method that supports.

An embodiment of the present invention provides a storage medium in which a computer-readable program is stored, of which the computer-readable program is a random access method that supports a plurality of types of TTIs according to the first embodiment in a user apparatus. To execute.

An embodiment of the present invention provides a computer-readable program, of which, when the program is executed in a base station, the program tells the computer the plurality of types of TTIs described in Example 2 in the base station. Run a random access method that supports.

An embodiment of the present invention provides a storage medium that stores a computer-readable program, wherein the computer-readable program is a random access method that supports a plurality of types of TTIs described in Example 2 in a base station. To execute.

The above-mentioned devices and methods of the present invention may be realized by software or hardware, or may be realized by a combination of hardware and software. The present invention further relates to a computer-readable program such as the following, that is, when the program is executed by a logic component, the logic component is made to realize the above-mentioned device or structural component, or the logic component. In addition, the various methods or steps described above are realized. The logic component may be, for example, an FPGA (Field Programmable Gate Array), a microprocessor, a processor used in a computer, or the like. The present invention further relates to a storage medium that stores the above-mentioned program, such as a hard disk, a magnetic disk, an optical hard disk, a DVD, or a flash memory.

Further, one or more of the functional blocks and / or a combination of one or more of the functional blocks described in the drawings are general-purpose processing devices and digital signal processing devices for performing the above-mentioned functions described in the present invention. It may be implemented as a (DSP), application specific integrated circuit (ASIC), FPGA (field-programmable gate array) or other programmable logic element, logic gate or transistor logic element, hardware assembly or any other suitable combination. .. Further, one or more of the functional blocks and / or one or a plurality of combinations of the functional blocks described in the drawings are combinations of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, and the like. It may be implemented as one or more microprocessors or any other configuration communicatively connected to the DSP.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and any modification to the present invention belongs to the technical scope of the present invention as long as the gist of the present invention is not deviated.

Claims (9)

A terminal device that supports multiple types of transmission time intervals and is capable of performing random access procedures.
A transmission unit that transmits a first message of the random access procedure including a preamble to a base station using a transmission time interval of one of the plurality of types of transmission time intervals.
Includes a receiving unit that receives the second message of the random access procedure from the base station that has received the first message.
The identification information used in the random access procedure is calculated based on the position of the slot for transmitting the preamble .
A terminal device characterized in that the transmission time interval corresponds to the length of the preamble. The terminal device according to claim 1, wherein the identification information is a random access wireless network temporary identifier (RA-RNTI). The second aspect of the present invention is the second aspect of the present invention, wherein the receiving unit starts monitoring a physical downlink control channel scrambled by the random access wireless network temporary identifier after a predetermined period of time has elapsed after transmitting the preamble. Terminal device. The terminal device according to any one of claims 1 to 3, wherein the identification information corresponds to information indicating a position of a slot for transmitting the preamble and information in a frequency domain. After receiving the second message, the transmitting unit transmits a third message of the random access procedure including the identifier of the terminal device.
The terminal device according to any one of claims 1 to 4, wherein the receiving unit receives a fourth message of the random access procedure transmitted from the base station in response to the third message. .. The plurality of types of transmission time intervals include a first type transmission time interval and a second type transmission time interval, and the first type transmission time interval and the second type transmission time interval are 1 ms or less. The terminal device according to any one of claims 1 to 5, wherein the terminal device is characterized by the above. A base station that supports multiple types of transmission time intervals and is capable of performing random access procedures.
A receiving unit that receives the first message of the random access procedure including a preamble transmitted from the terminal device using the transmission time interval of one of the plurality of types of transmission time intervals.
A transmission unit that transmits a second message of the random access procedure to the terminal device in response to the first message, and the like.
The identification information used in the random access procedure is calculated based on the position of the slot for transmitting the preamble .
A base station characterized in that the transmission time interval corresponds to the length of the preamble. The base station according to claim 7 , wherein the transmission unit transmits the physical downlink control channel scrambled according to the identification information and the second message. A communication method for terminal devices that supports multiple types of transmission time intervals and can execute random access procedures.
Using the transmission time interval of one of the plurality of types of transmission time intervals, the first message of the random access procedure including the preamble is transmitted to the base station.
The second message of the random access procedure is received from the base station that received the first message, and the second message is received.
The identification information used in the random access procedure is calculated based on the position of the slot for transmitting the preamble .
A communication method for a terminal device, wherein the transmission time interval corresponds to the length of the preamble.

Images